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postfix-2.9-20110212

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This commit is contained in:
Wietse Venema 2011-02-12 00:00:00 -05:00 committed by Viktor Dukhovni
parent 1ac00dbaf1
commit 1b9ba18ece
34 changed files with 1006 additions and 559 deletions
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15
postfix/HISTORY
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@ -16576,3 +16576,18 @@ Apologies for any names omitted.
Bugfix (introduced Postfix 2.8): segfault with smtpd_tls_loglevel
>= 3. Files: tls/tls_server.c, tls.h, smtpd.c, tlsproxy.c.
Cleanup: read/write deadline support for single_server TLS
applications (i.e. smtpd(8), smtp(8)). File: tls/tls_bio_ops.c.
20110212
Infrastructure: run-time switch for read/write deadline
support. Files: util/vstream.[hc], global/smtp_stream.[hc],
tls/tls_bio_ops.c.
Cleanup: configurable read/write deadline support with
smtpd_per_record_deadline (normal: "no", overload: "yes")
and smtp_per_record_deadline (default: "no"). Files:
global/mail_params.h, smtpd/smtpd.c, smtp/smtp.c,
smtp/smtp_proto.c, proto/postconf.proto, mantools/postlink.

20
postfix/README_FILES/MILTER_README
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@ -12,10 +12,11 @@ is queued.
The reason for adding Milter support to Postfix is that there exists a large
collection of applications, not only to block unwanted mail, but also to verify
authenticity (examples: DomainKeys Identified Mail (DKIM), SenderID+SPF and
DomainKeys) or to digitally sign mail (examples: DomainKeys Identified Mail
(DKIM), DomainKeys). Having yet another Postfix-specific version of all that
software is a poor use of human and system resources.
authenticity (examples: OpenDKIM, DomainKeys Identified Mail (DKIM),
SenderID+SPF and DomainKeys) or to digitally sign mail (examples: OpenDKIM,
DomainKeys Identified Mail (DKIM), DomainKeys). Having yet another Postfix-
specific version of all that software is a poor use of human and system
resources.
The Milter protocol has evolved over time, and different Postfix versions
implement different feature sets. See the workarounds and limitations sections
@ -92,8 +93,15 @@ such a library, but Sendmail does.
Sendmail libmilter library by default. With other systems, libmilter may be
provided by a package (called "sendmail-devel" on some Linux systems).
Once libmilter is installed, applications such as dkim-milter and sid-
milter build out of the box without requiring any tinkering:
Once libmilter is installed, applications such as OpenDKIM, dkim-milter and
sid-milter build out of the box without requiring any tinkering:
$ ggzzccaatt ooppeennddkkiimm--xx..yy..zz..ttaarr..ggzz || ttaarr xxff --
$ ccdd ooppeennddkkiimm--xx..yy..zz
$ ..//ccoonnffiigguurree ......ooppttiioonnss......
$ mmaakkee
[...lots of output omitted...]
$ mmaakkee iinnssttaallll
$ ggzzccaatt ddkkiimm--mmiilltteerr--xx..yy..zz..ttaarr..ggzz || ttaarr xxff --
$ ccdd ddkkiimm--mmiilltteerr--xx..yy..zz

5
postfix/README_FILES/POSTSCREEN_README
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@ -318,11 +318,12 @@ in SMTP engine anyway. This is to make postscreen(8) logging more informative.
When a client sends multiple commands, postscreen(8) logs this as:
CCOOMMMMAANNDD PPIIPPEELLIINNIINNGG aafftteerr time ffrroomm [address]:port
CCOOMMMMAANNDD PPIIPPEELLIINNIINNGG ffrroomm [address]:port aafftteerr command: text
Translation: the SMTP client at [address]:port sent multiple SMTP commands,
instead of sending one command and then waiting for the server to reply. This
happened time seconds after the "220 " server greeting was sent.
happened after the client sent command. The text shows part of the input that
was sent too early; it is not logged with Postfix 2.8.
The postscreen_pipelining_action parameter specifies the action that is taken
next. See "When tests fail after the 220 SMTP server greeting" below.

24
postfix/RELEASE_NOTES
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@ -14,6 +14,30 @@ specifies the release date of a stable release or snapshot release.
If you upgrade from Postfix 2.7 or earlier, read RELEASE_NOTES-2.8
before proceeding.
Major changes with snapshot 20110130
====================================
Support for per-record deadlines. These change the behavior of
Postfix timeout parameters, from a time limit per read or write
system call, to a time limit to send or receive a complete record
(an SMTP command line, SMTP response line, SMTP message content
line, or TLS protocol message). This limits the impact from hostile
peers that trickle data one byte at a time.
The new configuration parameters and their default settings are:
smtpd_per_record_deadline (normal: no, overload: yes),
smtp_per_record_deadline (no), and lmtp_per_record_deadline (no).
Note: when per-record deadlines are enabled, a short timeout may
cause problems with TLS over very slow network connections. The
reasons are that a TLS protocol message can be up to 16 kbytes long
(with TLSv1), and that an entire TLS protocol message must be sent
or received within the per-record deadline.
Per-record deadlines were introduced with postscreen(8). This program
does not receive mail, and therefore has no problems with TLS over
slow connections.
Incompatible changes with snapshot 20110130
===========================================

2
postfix/WISHLIST
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@ -9,6 +9,8 @@ Wish list:
Don't forget Apple's code donation for fetching mail from
IMAP server.
Update MILTER_README with pointer to OpenDKIM.
postconf command-line option to show the compile-time
settings (CCARGS, AUXLIBS) in case binary packages
don't install the makedefs.out file.

14
postfix/html/MILTER_README.html
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@ -28,11 +28,13 @@ SMTP commands (HELO, MAIL FROM, etc.) as well as mail content
<p> The reason for adding Milter support to Postfix is that there
exists a large collection of applications, not only to block unwanted
mail, but also to verify authenticity (examples: <a
href="http://www.opendkim.org/">OpenDKIM</a>, <a
href="http://sourceforge.net/projects/dkim-milter/">DomainKeys
Identified Mail (DKIM)</a>, <a
href="http://sourceforge.net/projects/sid-milter/">SenderID+SPF</a> and
<a href="http://sourceforge.net/projects/dk-milter/">DomainKeys</a>)
or to digitally sign mail (examples: <a
href="http://www.opendkim.org/">OpenDKIM</a>, <a
href="http://sourceforge.net/projects/dkim-milter/">DomainKeys
Identified Mail (DKIM)</a>, <a
href="http://sourceforge.net/projects/dk-milter/">DomainKeys</a>).
@ -212,10 +214,22 @@ other systems, libmilter may be provided by a package (called
"sendmail-devel" on some Linux systems). </p>
<p> Once libmilter is installed, applications such as <a
href="http://www.opendkim.org/">OpenDKIM</a>, <a
href="http://sourceforge.net/projects/dkim-milter/">dkim-milter</a> and
<a href="http://sourceforge.net/projects/sid-milter/">sid-milter</a>
build out of the box without requiring any tinkering:</p>
<blockquote>
<pre>
$ <b>gzcat opendkim-<i>x.y.z</i>.tar.gz | tar xf -</b>
$ <b>cd opendkim-<i>x.y.z</i></b>
$ <b>./configure ...<i>options</i>...</b>
$ <b>make</b>
[...<i>lots of output omitted</i>...]
$ <b>make install</b>
</pre>
</blockquote>
<blockquote>
<pre>
$ <b>gzcat dkim-milter-<i>x.y.z</i>.tar.gz | tar xf -</b>

11
postfix/html/POSTSCREEN_README.html
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@ -432,13 +432,14 @@ logging more informative. </p>
as: </p>
<pre>
<b>COMMAND PIPELINING after</b> <i>time</i> <b>from</b> <i>[address]:port</i>
<b>COMMAND PIPELINING from</b> <i>[address]:port</i> <b>after</b> <i>command</i>: <i>text</i>
</pre>
<p> Translation: the SMTP client at <i>[address]:port</i> sent multiple
SMTP commands, instead of sending one command and then waiting for
the server to reply. This happened <i>time</i> seconds after the
"220 " server greeting was sent. </p>
<p> Translation: the SMTP client at <i>[address]:port</i> sent
multiple SMTP commands, instead of sending one command and then
waiting for the server to reply. This happened after the client
sent <i>command</i>. The <i>text</i> shows part of the input that
was sent too early; it is not logged with Postfix 2.8. </p>
<p> The <a href="postconf.5.html#postscreen_pipelining_action">postscreen_pipelining_action</a> parameter specifies the action
that is taken next. See "<a href="#fail_after_220">When tests fail

214
postfix/html/lmtp.8.html
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@ -295,11 +295,21 @@ SMTP(8) SMTP(8)
<b><a href="postconf.5.html#smtp_dns_resolver_options">smtp_dns_resolver_options</a> (empty)</b>
DNS Resolver options for the Postfix SMTP client.
Available in Postfix version 2.9 and later:
<b><a href="postconf.5.html#smtp_per_record_deadline">smtp_per_record_deadline</a> (no)</b>
Change the behavior of the smtp_*_timeout time lim-
its, from a time limit per read or write system
call, to a time limit to read or write a complete
record (an SMTP command line, SMTP response line,
SMTP message content line, or TLS protocol mes-
sage).
<b>MIME PROCESSING CONTROLS</b>
Available in Postfix version 2.0 and later:
<b><a href="postconf.5.html#disable_mime_output_conversion">disable_mime_output_conversion</a> (no)</b>
Disable the conversion of 8BITMIME format to 7BIT
Disable the conversion of 8BITMIME format to 7BIT
format.
<b><a href="postconf.5.html#mime_boundary_length_limit">mime_boundary_length_limit</a> (2048)</b>
@ -314,108 +324,108 @@ SMTP(8) SMTP(8)
Available in Postfix version 2.1 and later:
<b><a href="postconf.5.html#smtp_send_xforward_command">smtp_send_xforward_command</a> (no)</b>
Send the non-standard XFORWARD command when the
Postfix SMTP server EHLO response announces XFOR-
Send the non-standard XFORWARD command when the
Postfix SMTP server EHLO response announces XFOR-
WARD support.
<b>SASL AUTHENTICATION CONTROLS</b>
<b><a href="postconf.5.html#smtp_sasl_auth_enable">smtp_sasl_auth_enable</a> (no)</b>
Enable SASL authentication in the Postfix SMTP
Enable SASL authentication in the Postfix SMTP
client.
<b><a href="postconf.5.html#smtp_sasl_password_maps">smtp_sasl_password_maps</a> (empty)</b>
Optional SMTP client lookup tables with one user-
name:password entry per remote hostname or domain,
Optional SMTP client lookup tables with one user-
name:password entry per remote hostname or domain,
or sender address when sender-dependent authentica-
tion is enabled.
<b><a href="postconf.5.html#smtp_sasl_security_options">smtp_sasl_security_options</a> (noplaintext, noanonymous)</b>
Postfix SMTP client SASL security options; as of
Postfix 2.3 the list of available features depends
on the SASL client implementation that is selected
Postfix SMTP client SASL security options; as of
Postfix 2.3 the list of available features depends
on the SASL client implementation that is selected
with <b><a href="postconf.5.html#smtp_sasl_type">smtp_sasl_type</a></b>.
Available in Postfix version 2.2 and later:
<b><a href="postconf.5.html#smtp_sasl_mechanism_filter">smtp_sasl_mechanism_filter</a> (empty)</b>
If non-empty, a Postfix SMTP client filter for the
remote SMTP server's list of offered SASL mecha-
If non-empty, a Postfix SMTP client filter for the
remote SMTP server's list of offered SASL mecha-
nisms.
Available in Postfix version 2.3 and later:
<b><a href="postconf.5.html#smtp_sender_dependent_authentication">smtp_sender_dependent_authentication</a> (no)</b>
Enable sender-dependent authentication in the Post-
fix SMTP client; this is available only with SASL
authentication, and disables SMTP connection
caching to ensure that mail from different senders
fix SMTP client; this is available only with SASL
authentication, and disables SMTP connection
caching to ensure that mail from different senders
will use the appropriate credentials.
<b><a href="postconf.5.html#smtp_sasl_path">smtp_sasl_path</a> (empty)</b>
Implementation-specific information that the Post-
fix SMTP client passes through to the SASL plug-in
implementation that is selected with
Implementation-specific information that the Post-
fix SMTP client passes through to the SASL plug-in
implementation that is selected with
<b><a href="postconf.5.html#smtp_sasl_type">smtp_sasl_type</a></b>.
<b><a href="postconf.5.html#smtp_sasl_type">smtp_sasl_type</a> (cyrus)</b>
The SASL plug-in type that the Postfix SMTP client
The SASL plug-in type that the Postfix SMTP client
should use for authentication.
Available in Postfix version 2.5 and later:
<b><a href="postconf.5.html#smtp_sasl_auth_cache_name">smtp_sasl_auth_cache_name</a> (empty)</b>
An optional table to prevent repeated SASL authen-
tication failures with the same remote SMTP server
An optional table to prevent repeated SASL authen-
tication failures with the same remote SMTP server
hostname, username and password.
<b><a href="postconf.5.html#smtp_sasl_auth_cache_time">smtp_sasl_auth_cache_time</a> (90d)</b>
The maximal age of an <a href="postconf.5.html#smtp_sasl_auth_cache_name">smtp_sasl_auth_cache_name</a>
The maximal age of an <a href="postconf.5.html#smtp_sasl_auth_cache_name">smtp_sasl_auth_cache_name</a>
entry before it is removed.
<b><a href="postconf.5.html#smtp_sasl_auth_soft_bounce">smtp_sasl_auth_soft_bounce</a> (yes)</b>
When a remote SMTP server rejects a SASL authenti-
cation request with a 535 reply code, defer mail
delivery instead of returning mail as undeliver-
When a remote SMTP server rejects a SASL authenti-
cation request with a 535 reply code, defer mail
delivery instead of returning mail as undeliver-
able.
<b>STARTTLS SUPPORT CONTROLS</b>
Detailed information about STARTTLS configuration may be
Detailed information about STARTTLS configuration may be
found in the <a href="TLS_README.html">TLS_README</a> document.
<b><a href="postconf.5.html#smtp_tls_security_level">smtp_tls_security_level</a> (empty)</b>
The default SMTP TLS security level for the Postfix
SMTP client; when a non-empty value is specified,
this overrides the obsolete parameters
SMTP client; when a non-empty value is specified,
this overrides the obsolete parameters
<a href="postconf.5.html#smtp_use_tls">smtp_use_tls</a>, <a href="postconf.5.html#smtp_enforce_tls">smtp_enforce_tls</a>, and
<a href="postconf.5.html#smtp_tls_enforce_peername">smtp_tls_enforce_peername</a>.
<b><a href="postconf.5.html#smtp_sasl_tls_security_options">smtp_sasl_tls_security_options</a> ($<a href="postconf.5.html#smtp_sasl_security_options">smtp_sasl_secu</a>-</b>
<b><a href="postconf.5.html#smtp_sasl_security_options">rity_options</a>)</b>
The SASL authentication security options that the
Postfix SMTP client uses for TLS encrypted SMTP
The SASL authentication security options that the
Postfix SMTP client uses for TLS encrypted SMTP
sessions.
<b><a href="postconf.5.html#smtp_starttls_timeout">smtp_starttls_timeout</a> (300s)</b>
Time limit for Postfix SMTP client write and read
operations during TLS startup and shutdown hand-
Time limit for Postfix SMTP client write and read
operations during TLS startup and shutdown hand-
shake procedures.
<b><a href="postconf.5.html#smtp_tls_CAfile">smtp_tls_CAfile</a> (empty)</b>
A file containing CA certificates of root CAs
trusted to sign either remote SMTP server certifi-
A file containing CA certificates of root CAs
trusted to sign either remote SMTP server certifi-
cates or intermediate CA certificates.
<b><a href="postconf.5.html#smtp_tls_CApath">smtp_tls_CApath</a> (empty)</b>
Directory with PEM format certificate authority
certificates that the Postfix SMTP client uses to
Directory with PEM format certificate authority
certificates that the Postfix SMTP client uses to
verify a remote SMTP server certificate.
<b><a href="postconf.5.html#smtp_tls_cert_file">smtp_tls_cert_file</a> (empty)</b>
File with the Postfix SMTP client RSA certificate
File with the Postfix SMTP client RSA certificate
in PEM format.
<b><a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a> (medium)</b>
The minimum TLS cipher grade that the Postfix SMTP
The minimum TLS cipher grade that the Postfix SMTP
client will use with mandatory TLS encryption.
<b><a href="postconf.5.html#smtp_tls_exclude_ciphers">smtp_tls_exclude_ciphers</a> (empty)</b>
@ -424,43 +434,43 @@ SMTP(8) SMTP(8)
levels.
<b><a href="postconf.5.html#smtp_tls_mandatory_exclude_ciphers">smtp_tls_mandatory_exclude_ciphers</a> (empty)</b>
Additional list of ciphers or cipher types to
exclude from the SMTP client cipher list at manda-
Additional list of ciphers or cipher types to
exclude from the SMTP client cipher list at manda-
tory TLS security levels.
<b><a href="postconf.5.html#smtp_tls_dcert_file">smtp_tls_dcert_file</a> (empty)</b>
File with the Postfix SMTP client DSA certificate
File with the Postfix SMTP client DSA certificate
in PEM format.
<b><a href="postconf.5.html#smtp_tls_dkey_file">smtp_tls_dkey_file</a> ($<a href="postconf.5.html#smtp_tls_dcert_file">smtp_tls_dcert_file</a>)</b>
File with the Postfix SMTP client DSA private key
File with the Postfix SMTP client DSA private key
in PEM format.
<b><a href="postconf.5.html#smtp_tls_key_file">smtp_tls_key_file</a> ($<a href="postconf.5.html#smtp_tls_cert_file">smtp_tls_cert_file</a>)</b>
File with the Postfix SMTP client RSA private key
File with the Postfix SMTP client RSA private key
in PEM format.
<b><a href="postconf.5.html#smtp_tls_loglevel">smtp_tls_loglevel</a> (0)</b>
Enable additional Postfix SMTP client logging of
Enable additional Postfix SMTP client logging of
TLS activity.
<b><a href="postconf.5.html#smtp_tls_note_starttls_offer">smtp_tls_note_starttls_offer</a> (no)</b>
Log the hostname of a remote SMTP server that
offers STARTTLS, when TLS is not already enabled
Log the hostname of a remote SMTP server that
offers STARTTLS, when TLS is not already enabled
for that server.
<b><a href="postconf.5.html#smtp_tls_policy_maps">smtp_tls_policy_maps</a> (empty)</b>
Optional lookup tables with the Postfix SMTP client
TLS security policy by next-hop destination; when a
non-empty value is specified, this overrides the
non-empty value is specified, this overrides the
obsolete <a href="postconf.5.html#smtp_tls_per_site">smtp_tls_per_site</a> parameter.
<b><a href="postconf.5.html#smtp_tls_mandatory_protocols">smtp_tls_mandatory_protocols</a> (SSLv3, TLSv1)</b>
List of SSL/TLS protocols that the Postfix SMTP
List of SSL/TLS protocols that the Postfix SMTP
client will use with mandatory TLS encryption.
<b><a href="postconf.5.html#smtp_tls_scert_verifydepth">smtp_tls_scert_verifydepth</a> (9)</b>
The verification depth for remote SMTP server cer-
The verification depth for remote SMTP server cer-
tificates.
<b><a href="postconf.5.html#smtp_tls_secure_cert_match">smtp_tls_secure_cert_match</a> (nexthop, dot-nexthop)</b>
@ -468,7 +478,7 @@ SMTP(8) SMTP(8)
for the "secure" TLS security level.
<b><a href="postconf.5.html#smtp_tls_session_cache_database">smtp_tls_session_cache_database</a> (empty)</b>
Name of the file containing the optional Postfix
Name of the file containing the optional Postfix
SMTP client TLS session cache.
<b><a href="postconf.5.html#smtp_tls_session_cache_timeout">smtp_tls_session_cache_timeout</a> (3600s)</b>
@ -480,9 +490,9 @@ SMTP(8) SMTP(8)
for the "verify" TLS security level.
<b><a href="postconf.5.html#tls_daemon_random_bytes">tls_daemon_random_bytes</a> (32)</b>
The number of pseudo-random bytes that an <a href="smtp.8.html"><b>smtp</b>(8)</a>
or <a href="smtpd.8.html"><b>smtpd</b>(8)</a> process requests from the <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a>
server in order to seed its internal pseudo random
The number of pseudo-random bytes that an <a href="smtp.8.html"><b>smtp</b>(8)</a>
or <a href="smtpd.8.html"><b>smtpd</b>(8)</a> process requests from the <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a>
server in order to seed its internal pseudo random
number generator (PRNG).
<b><a href="postconf.5.html#tls_high_cipherlist">tls_high_cipherlist</a></b>
@ -494,7 +504,7 @@ SMTP(8) SMTP(8)
ciphers.
<b><a href="postconf.5.html#tls_low_cipherlist">tls_low_cipherlist</a> (ALL:!EXPORT:+RC4:@STRENGTH)</b>
The OpenSSL cipherlist for "LOW" or higher grade
The OpenSSL cipherlist for "LOW" or higher grade
ciphers.
<b><a href="postconf.5.html#tls_export_cipherlist">tls_export_cipherlist</a> (ALL:+RC4:@STRENGTH)</b>
@ -502,38 +512,38 @@ SMTP(8) SMTP(8)
ciphers.
<b><a href="postconf.5.html#tls_null_cipherlist">tls_null_cipherlist</a> (eNULL:!aNULL)</b>
The OpenSSL cipherlist for "NULL" grade ciphers
The OpenSSL cipherlist for "NULL" grade ciphers
that provide authentication without encryption.
Available in Postfix version 2.4 and later:
<b><a href="postconf.5.html#smtp_sasl_tls_verified_security_options">smtp_sasl_tls_verified_security_options</a></b>
<b>($<a href="postconf.5.html#smtp_sasl_tls_security_options">smtp_sasl_tls_security_options</a>)</b>
The SASL authentication security options that the
Postfix SMTP client uses for TLS encrypted SMTP
The SASL authentication security options that the
Postfix SMTP client uses for TLS encrypted SMTP
sessions with a verified server certificate.
Available in Postfix version 2.5 and later:
<b><a href="postconf.5.html#smtp_tls_fingerprint_cert_match">smtp_tls_fingerprint_cert_match</a> (empty)</b>
List of acceptable remote SMTP server certificate
fingerprints for the "fingerprint" TLS security
List of acceptable remote SMTP server certificate
fingerprints for the "fingerprint" TLS security
level (<b><a href="postconf.5.html#smtp_tls_security_level">smtp_tls_security_level</a></b> = fingerprint).
<b><a href="postconf.5.html#smtp_tls_fingerprint_digest">smtp_tls_fingerprint_digest</a> (md5)</b>
The message digest algorithm used to construct
The message digest algorithm used to construct
remote SMTP server certificate fingerprints.
Available in Postfix version 2.6 and later:
<b><a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a> (!SSLv2)</b>
List of TLS protocols that the Postfix SMTP client
will exclude or include with opportunistic TLS
List of TLS protocols that the Postfix SMTP client
will exclude or include with opportunistic TLS
encryption.
<b><a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a> (export)</b>
The minimum TLS cipher grade that the Postfix SMTP
client will use with opportunistic TLS encryption.
The minimum TLS cipher grade that the Postfix SMTP
client will use with opportunistic TLS encryption.
<b><a href="postconf.5.html#smtp_tls_eccert_file">smtp_tls_eccert_file</a> (empty)</b>
File with the Postfix SMTP client ECDSA certificate
@ -546,40 +556,40 @@ SMTP(8) SMTP(8)
Available in Postfix version 2.7 and later:
<b><a href="postconf.5.html#smtp_tls_block_early_mail_reply">smtp_tls_block_early_mail_reply</a> (no)</b>
Try to detect a mail hijacking attack based on a
TLS protocol vulnerability (CVE-2009-3555), where
an attacker prepends malicious HELO, MAIL, RCPT,
Try to detect a mail hijacking attack based on a
TLS protocol vulnerability (CVE-2009-3555), where
an attacker prepends malicious HELO, MAIL, RCPT,
DATA commands to a Postfix SMTP client TLS session.
Available in Postfix version 2.8 and later:
<b><a href="postconf.5.html#tls_disable_workarounds">tls_disable_workarounds</a> (see 'postconf -d' output)</b>
List or bit-mask of OpenSSL bug work-arounds to
List or bit-mask of OpenSSL bug work-arounds to
disable.
<b>OBSOLETE STARTTLS CONTROLS</b>
The following configuration parameters exist for compati-
The following configuration parameters exist for compati-
bility with Postfix versions before 2.3. Support for these
will be removed in a future release.
<b><a href="postconf.5.html#smtp_use_tls">smtp_use_tls</a> (no)</b>
Opportunistic mode: use TLS when a remote SMTP
server announces STARTTLS support, otherwise send
Opportunistic mode: use TLS when a remote SMTP
server announces STARTTLS support, otherwise send
the mail in the clear.
<b><a href="postconf.5.html#smtp_enforce_tls">smtp_enforce_tls</a> (no)</b>
Enforcement mode: require that remote SMTP servers
use TLS encryption, and never send mail in the
Enforcement mode: require that remote SMTP servers
use TLS encryption, and never send mail in the
clear.
<b><a href="postconf.5.html#smtp_tls_enforce_peername">smtp_tls_enforce_peername</a> (yes)</b>
With mandatory TLS encryption, require that the
With mandatory TLS encryption, require that the
remote SMTP server hostname matches the information
in the remote SMTP server certificate.
<b><a href="postconf.5.html#smtp_tls_per_site">smtp_tls_per_site</a> (empty)</b>
Optional lookup tables with the Postfix SMTP client
TLS usage policy by next-hop destination and by
TLS usage policy by next-hop destination and by
remote SMTP server hostname.
<b><a href="postconf.5.html#smtp_tls_cipherlist">smtp_tls_cipherlist</a> (empty)</b>
@ -589,27 +599,27 @@ SMTP(8) SMTP(8)
<b>RESOURCE AND RATE CONTROLS</b>
<b><a href="postconf.5.html#smtp_destination_concurrency_limit">smtp_destination_concurrency_limit</a> ($<a href="postconf.5.html#default_destination_concurrency_limit">default_destina</a>-</b>
<b><a href="postconf.5.html#default_destination_concurrency_limit">tion_concurrency_limit</a>)</b>
The maximal number of parallel deliveries to the
same destination via the smtp message delivery
The maximal number of parallel deliveries to the
same destination via the smtp message delivery
transport.
<b><a href="postconf.5.html#smtp_destination_recipient_limit">smtp_destination_recipient_limit</a> ($<a href="postconf.5.html#default_destination_recipient_limit">default_destina</a>-</b>
<b><a href="postconf.5.html#default_destination_recipient_limit">tion_recipient_limit</a>)</b>
The maximal number of recipients per message for
The maximal number of recipients per message for
the smtp message delivery transport.
<b><a href="postconf.5.html#smtp_connect_timeout">smtp_connect_timeout</a> (30s)</b>
The SMTP client time limit for completing a TCP
The SMTP client time limit for completing a TCP
connection, or zero (use the operating system
built-in time limit).
<b><a href="postconf.5.html#smtp_helo_timeout">smtp_helo_timeout</a> (300s)</b>
The SMTP client time limit for sending the HELO or
EHLO command, and for receiving the initial server
The SMTP client time limit for sending the HELO or
EHLO command, and for receiving the initial server
response.
<b><a href="postconf.5.html#lmtp_lhlo_timeout">lmtp_lhlo_timeout</a> (300s)</b>
The LMTP client time limit for sending the LHLO
The LMTP client time limit for sending the LHLO
command, and for receiving the initial server
response.
@ -618,30 +628,30 @@ SMTP(8) SMTP(8)
command, and for receiving the server response.
<b><a href="postconf.5.html#smtp_mail_timeout">smtp_mail_timeout</a> (300s)</b>
The SMTP client time limit for sending the MAIL
FROM command, and for receiving the server
The SMTP client time limit for sending the MAIL
FROM command, and for receiving the server
response.
<b><a href="postconf.5.html#smtp_rcpt_timeout">smtp_rcpt_timeout</a> (300s)</b>
The SMTP client time limit for sending the SMTP
RCPT TO command, and for receiving the server
The SMTP client time limit for sending the SMTP
RCPT TO command, and for receiving the server
response.
<b><a href="postconf.5.html#smtp_data_init_timeout">smtp_data_init_timeout</a> (120s)</b>
The SMTP client time limit for sending the SMTP
DATA command, and for receiving the server
The SMTP client time limit for sending the SMTP
DATA command, and for receiving the server
response.
<b><a href="postconf.5.html#smtp_data_xfer_timeout">smtp_data_xfer_timeout</a> (180s)</b>
The SMTP client time limit for sending the SMTP
The SMTP client time limit for sending the SMTP
message content.
<b><a href="postconf.5.html#smtp_data_done_timeout">smtp_data_done_timeout</a> (600s)</b>
The SMTP client time limit for sending the SMTP
The SMTP client time limit for sending the SMTP
".", and for receiving the server response.
<b><a href="postconf.5.html#smtp_quit_timeout">smtp_quit_timeout</a> (300s)</b>
The SMTP client time limit for sending the QUIT
The SMTP client time limit for sending the QUIT
command, and for receiving the server response.
Available in Postfix version 2.1 and later:
@ -652,12 +662,12 @@ SMTP(8) SMTP(8)
lookups, or zero (no limit).
<b><a href="postconf.5.html#smtp_mx_session_limit">smtp_mx_session_limit</a> (2)</b>
The maximal number of SMTP sessions per delivery
request before giving up or delivering to a fall-
The maximal number of SMTP sessions per delivery
request before giving up or delivering to a fall-
back <a href="postconf.5.html#relayhost">relay host</a>, or zero (no limit).
<b><a href="postconf.5.html#smtp_rset_timeout">smtp_rset_timeout</a> (20s)</b>
The SMTP client time limit for sending the RSET
The SMTP client time limit for sending the RSET
command, and for receiving the server response.
Available in Postfix version 2.2 and earlier:
@ -669,11 +679,11 @@ SMTP(8) SMTP(8)
Available in Postfix version 2.2 and later:
<b><a href="postconf.5.html#smtp_connection_cache_destinations">smtp_connection_cache_destinations</a> (empty)</b>
Permanently enable SMTP connection caching for the
Permanently enable SMTP connection caching for the
specified destinations.
<b><a href="postconf.5.html#smtp_connection_cache_on_demand">smtp_connection_cache_on_demand</a> (yes)</b>
Temporarily enable SMTP connection caching while a
Temporarily enable SMTP connection caching while a
destination has a high volume of mail in the active
queue.
@ -683,15 +693,25 @@ SMTP(8) SMTP(8)
<b><a href="postconf.5.html#smtp_connection_cache_time_limit">smtp_connection_cache_time_limit</a> (2s)</b>
When SMTP connection caching is enabled, the amount
of time that an unused SMTP client socket is kept
of time that an unused SMTP client socket is kept
open before it is closed.
Available in Postfix version 2.3 and later:
<b><a href="postconf.5.html#connection_cache_protocol_timeout">connection_cache_protocol_timeout</a> (5s)</b>
Time limit for connection cache connect, send or
Time limit for connection cache connect, send or
receive operations.
Available in Postfix version 2.9 and later:
<b><a href="postconf.5.html#smtp_per_record_deadline">smtp_per_record_deadline</a> (no)</b>
Change the behavior of the smtp_*_timeout time lim-
its, from a time limit per read or write system
call, to a time limit to read or write a complete
record (an SMTP command line, SMTP response line,
SMTP message content line, or TLS protocol mes-
sage).
<b>TROUBLE SHOOTING CONTROLS</b>
<b><a href="postconf.5.html#debug_peer_level">debug_peer_level</a> (2)</b>
The increment in verbose logging level when a

57
postfix/html/postconf.5.html
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@ -4034,6 +4034,17 @@ configuration parameter. See there for details. </p>
<p> This feature is available in Postfix 2.5 and later. </p>
</DD>
<DT><b><a name="lmtp_per_record_deadline">lmtp_per_record_deadline</a>
(default: no)</b></DT><DD>
<p> The LMTP-specific version of the <a href="postconf.5.html#smtp_per_record_deadline">smtp_per_record_deadline</a>
configuration parameter. See there for details. </p>
<p> This feature is available in Postfix 2.8 and later. </p>
</DD>
<DT><b><a name="lmtp_pix_workaround_delay_time">lmtp_pix_workaround_delay_time</a>
@ -9545,6 +9556,29 @@ available. </p>
<a href="postconf.5.html#smtp_always_send_ehlo">smtp_always_send_ehlo</a> parameter. </p>
</DD>
<DT><b><a name="smtp_per_record_deadline">smtp_per_record_deadline</a>
(default: no)</b></DT><DD>
<p> Change the behavior of the smtp_*_timeout time limits, from a
time limit per read or write system call, to a time limit to send
or receive a complete record (an SMTP command line, SMTP response
line, SMTP message content line, or TLS protocol message). This
limits the impact from hostile peers that trickle data one byte at
a time. </p>
<p> Note: when per-record deadlines are enabled, a short timeout
may cause problems with TLS over very slow network connections.
The reasons are that a TLS protocol message can be up to 16 kbytes
long (with TLSv1), and that an entire TLS protocol message must be
sent or received within the per-record deadline. </p>
<p> This feature is available in Postfix 2.9 and later. With older
Postfix releases, the behavior is as if this parameter is set to
"no". </p>
</DD>
<DT><b><a name="smtp_pix_workaround_delay_time">smtp_pix_workaround_delay_time</a>
@ -12697,6 +12731,29 @@ DNS lookup and increases the maximal inbound delivery rate. </p>
<p> This feature is available in Postfix 2.3 and later. </p>
</DD>
<DT><b><a name="smtpd_per_record_deadline">smtpd_per_record_deadline</a>
(default: normal: no, overload: yes)</b></DT><DD>
<p> Change the behavior of the <a href="postconf.5.html#smtpd_timeout">smtpd_timeout</a> time limit, from a
time limit per read or write system call, to a time limit to send
or receive a complete record (an SMTP command line, SMTP response
line, SMTP message content line, or TLS protocol message). This
limits the impact from hostile peers that trickle data one byte at
a time. </p>
<p> Note: when per-record deadlines are enabled, a short timeout
may cause problems with TLS over very slow network connections.
The reasons are that a TLS protocol message can be up to 16 kbytes
long (with TLSv1), and that an entire TLS protocol message must be
sent or received within the per-record deadline. </p>
<p> This feature is available in Postfix 2.9 and later. With older
Postfix releases, the behavior is as if this parameter is set to
"no". </p>
</DD>
<DT><b><a name="smtpd_policy_service_max_idle">smtpd_policy_service_max_idle</a>

211
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@ -76,64 +76,65 @@ POSTSCREEN(8) POSTSCREEN(8)
Support for AUTH may be added in the future. In the mean
time, if you need to make these services available on port
25, then do not enable the optional "after 220 server
greeting" tests.
greeting" tests, and do not use DNSBLs that reject traffic
from dial-up and residential networks.
The optional "after 220 server greeting" tests involve
<a href="postscreen.8.html"><b>postscreen</b>(8)</a>'s built-in SMTP protocol engine. When these
The optional "after 220 server greeting" tests involve
<a href="postscreen.8.html"><b>postscreen</b>(8)</a>'s built-in SMTP protocol engine. When these
tests succeed, <a href="postscreen.8.html"><b>postscreen</b>(8)</a> adds the client to the tempo-
rary whitelist but it cannot not hand off the "live" con-
nection to a Postfix SMTP server process in the middle of
a session. Instead, <a href="postscreen.8.html"><b>postscreen</b>(8)</a> defers attempts to
deliver mail with a 4XX status, and waits for the client
to disconnect. The next time a good client connects, it
will be allowed to talk to a Postfix SMTP server process
to deliver mail. <a href="postscreen.8.html"><b>postscreen</b>(8)</a> mitigates the impact of
this limitation by giving such tests a long expiration
rary whitelist but it cannot not hand off the "live" con-
nection to a Postfix SMTP server process in the middle of
a session. Instead, <a href="postscreen.8.html"><b>postscreen</b>(8)</a> defers attempts to
deliver mail with a 4XX status, and waits for the client
to disconnect. The next time a good client connects, it
will be allowed to talk to a Postfix SMTP server process
to deliver mail. <a href="postscreen.8.html"><b>postscreen</b>(8)</a> mitigates the impact of
this limitation by giving such tests a long expiration
time.
<b>CONFIGURATION PARAMETERS</b>
Changes to <a href="postconf.5.html">main.cf</a> are not picked up automatically, as
<a href="postscreen.8.html"><b>postscreen</b>(8)</a> processes may run for several hours. Use
Changes to <a href="postconf.5.html">main.cf</a> are not picked up automatically, as
<a href="postscreen.8.html"><b>postscreen</b>(8)</a> processes may run for several hours. Use
the command "postfix reload" after a configuration change.
The text below provides only a parameter summary. See
The text below provides only a parameter summary. See
<a href="postconf.5.html"><b>postconf</b>(5)</a> for more details including examples.
NOTE: Some <a href="postscreen.8.html"><b>postscreen</b>(8)</a> parameters implement stress-
dependent behavior. This is supported only when the
default parameter value is stress-dependent (that is, it
looks like ${stress?X}${stress:Y}, or it is the $<i>name</i> of
dependent behavior. This is supported only when the
default parameter value is stress-dependent (that is, it
looks like ${stress?X}${stress:Y}, or it is the $<i>name</i> of
an smtpd parameter with a stress-dependent default).
Other parameters always evaluate as if the <b>stress</b> parame-
Other parameters always evaluate as if the <b>stress</b> parame-
ter value is the empty string.
<b>COMPATIBILITY CONTROLS</b>
<b><a href="postconf.5.html#postscreen_command_filter">postscreen_command_filter</a> ($<a href="postconf.5.html#smtpd_command_filter">smtpd_command_filter</a>)</b>
A mechanism to transform commands from remote SMTP
A mechanism to transform commands from remote SMTP
clients.
<b><a href="postconf.5.html#postscreen_discard_ehlo_keyword_address_maps">postscreen_discard_ehlo_keyword_address_maps</a> ($<a href="postconf.5.html#smtpd_discard_ehlo_keyword_address_maps">smtpd_dis</a>-</b>
<b><a href="postconf.5.html#smtpd_discard_ehlo_keyword_address_maps">card_ehlo_keyword_address_maps</a>)</b>
Lookup tables, indexed by the remote SMTP client
address, with case insensitive lists of EHLO key-
words (pipelining, starttls, auth, etc.) that the
<a href="postscreen.8.html"><b>postscreen</b>(8)</a> server will not send in the EHLO
Lookup tables, indexed by the remote SMTP client
address, with case insensitive lists of EHLO key-
words (pipelining, starttls, auth, etc.) that the
<a href="postscreen.8.html"><b>postscreen</b>(8)</a> server will not send in the EHLO
response to a remote SMTP client.
<b><a href="postconf.5.html#postscreen_discard_ehlo_keywords">postscreen_discard_ehlo_keywords</a> ($<a href="postconf.5.html#smtpd_discard_ehlo_keywords">smtpd_discard_ehlo_key</a>-</b>
<b><a href="postconf.5.html#smtpd_discard_ehlo_keywords">words</a>)</b>
A case insensitive list of EHLO keywords (pipelin-
ing, starttls, auth, etc.) that the <a href="postscreen.8.html"><b>postscreen</b>(8)</a>
server will not send in the EHLO response to a
A case insensitive list of EHLO keywords (pipelin-
ing, starttls, auth, etc.) that the <a href="postscreen.8.html"><b>postscreen</b>(8)</a>
server will not send in the EHLO response to a
remote SMTP client.
<b>TROUBLE SHOOTING CONTROLS</b>
<b><a href="postconf.5.html#postscreen_expansion_filter">postscreen_expansion_filter</a> (see 'postconf -d' output)</b>
List of characters that are permitted in
List of characters that are permitted in
<a href="postconf.5.html#postscreen_reject_footer">postscreen_reject_footer</a> attribute expansions.
<b><a href="postconf.5.html#postscreen_reject_footer">postscreen_reject_footer</a> ($<a href="postconf.5.html#smtpd_reject_footer">smtpd_reject_footer</a>)</b>
Optional information that is appended after a 4XX
Optional information that is appended after a 4XX
or 5XX server response.
<b><a href="postconf.5.html#soft_bounce">soft_bounce</a> (no)</b>
@ -141,9 +142,9 @@ POSTSCREEN(8) POSTSCREEN(8)
be returned to the sender.
<b>PERMANENT WHITE/BLACKLIST TEST</b>
This test is executed immediately after a remote SMTP
client connects. If a client is permanently whitelisted,
the client will be handed off immediately to a Postfix
This test is executed immediately after a remote SMTP
client connects. If a client is permanently whitelisted,
the client will be handed off immediately to a Postfix
SMTP server process.
<b><a href="postconf.5.html#postscreen_access_list">postscreen_access_list</a> (<a href="postconf.5.html#permit_mynetworks">permit_mynetworks</a>)</b>
@ -151,45 +152,45 @@ POSTSCREEN(8) POSTSCREEN(8)
addresses.
<b><a href="postconf.5.html#postscreen_blacklist_action">postscreen_blacklist_action</a> (ignore)</b>
The action that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> takes when an SMTP
client is permanently blacklisted with the
The action that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> takes when an SMTP
client is permanently blacklisted with the
<a href="postconf.5.html#postscreen_access_list">postscreen_access_list</a> parameter.
<b>BEFORE-GREETING TESTS</b>
These tests are executed before the remote SMTP client
These tests are executed before the remote SMTP client
receives the "220 servername" greeting. If no tests remain
after the successful completion of this phase, the client
will be handed off immediately to a Postfix SMTP server
after the successful completion of this phase, the client
will be handed off immediately to a Postfix SMTP server
process.
<b><a href="postconf.5.html#dnsblog_service_name">dnsblog_service_name</a> (dnsblog)</b>
The name of the <a href="dnsblog.8.html"><b>dnsblog</b>(8)</a> service entry in mas-
The name of the <a href="dnsblog.8.html"><b>dnsblog</b>(8)</a> service entry in mas-
ter.cf.
<b><a href="postconf.5.html#postscreen_dnsbl_action">postscreen_dnsbl_action</a> (ignore)</b>
The action that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> takes when an SMTP
The action that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> takes when an SMTP
client's combined DNSBL score is equal to or
greater than a threshold (as defined with the
greater than a threshold (as defined with the
<a href="postconf.5.html#postscreen_dnsbl_sites">postscreen_dnsbl_sites</a> and <a href="postconf.5.html#postscreen_dnsbl_threshold">postscreen_dnsbl_thresh</a>-
<a href="postconf.5.html#postscreen_dnsbl_threshold">old</a> parameters).
<b><a href="postconf.5.html#postscreen_dnsbl_reply_map">postscreen_dnsbl_reply_map</a> (empty)</b>
A mapping from actual DNSBL domain name which
includes a secret password, to the DNSBL domain
A mapping from actual DNSBL domain name which
includes a secret password, to the DNSBL domain
name that postscreen will reply with when it
rejects mail.
<b><a href="postconf.5.html#postscreen_dnsbl_sites">postscreen_dnsbl_sites</a> (empty)</b>
Optional list of DNS white/blacklist domains, fil-
Optional list of DNS white/blacklist domains, fil-
ters and weight factors.
<b><a href="postconf.5.html#postscreen_dnsbl_threshold">postscreen_dnsbl_threshold</a> (1)</b>
The inclusive lower bound for blocking an SMTP
The inclusive lower bound for blocking an SMTP
client, based on its combined DNSBL score as
defined with the <a href="postconf.5.html#postscreen_dnsbl_sites">postscreen_dnsbl_sites</a> parameter.
defined with the <a href="postconf.5.html#postscreen_dnsbl_sites">postscreen_dnsbl_sites</a> parameter.
<b><a href="postconf.5.html#postscreen_greet_action">postscreen_greet_action</a> (ignore)</b>
The action that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> takes when an SMTP
The action that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> takes when an SMTP
client speaks before its turn within the time spec-
ified with the <a href="postconf.5.html#postscreen_greet_wait">postscreen_greet_wait</a> parameter.
@ -197,39 +198,39 @@ POSTSCREEN(8) POSTSCREEN(8)
The <i>text</i> in the optional "220-<i>text</i>..." server
response that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> sends ahead of the real
Postfix SMTP server's "220 text..." response, in an
attempt to confuse bad SMTP clients so that they
attempt to confuse bad SMTP clients so that they
speak before their turn (pre-greet).
<b><a href="postconf.5.html#postscreen_greet_wait">postscreen_greet_wait</a> (${stress?2}${stress:6}s)</b>
The amount of time that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> will wait for
an SMTP client to send a command before its turn,
and for DNS blocklist lookup results to arrive
(default: up to 2 seconds under stress, up to 6
an SMTP client to send a command before its turn,
and for DNS blocklist lookup results to arrive
(default: up to 2 seconds under stress, up to 6
seconds otherwise).
<b><a href="postconf.5.html#smtpd_service_name">smtpd_service_name</a> (smtpd)</b>
The internal service that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> forwards
The internal service that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> forwards
allowed connections to.
<b>AFTER-GREETING TESTS</b>
These tests are executed after the remote SMTP client
These tests are executed after the remote SMTP client
receives the "220 servername" greeting. If a client passes
all tests during this phase, it will receive a 4XX
response to RCPT TO commands until the client hangs up.
all tests during this phase, it will receive a 4XX
response to RCPT TO commands until the client hangs up.
After this, the client will be allowed to talk directly to
a Postfix SMTP server process.
<b><a href="postconf.5.html#postscreen_bare_newline_action">postscreen_bare_newline_action</a> (ignore)</b>
The action that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> takes when an SMTP
client sends a bare newline character, that is, a
The action that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> takes when an SMTP
client sends a bare newline character, that is, a
newline not preceded by carriage return.
<b><a href="postconf.5.html#postscreen_bare_newline_enable">postscreen_bare_newline_enable</a> (no)</b>
Enable "bare newline" SMTP protocol tests in the
Enable "bare newline" SMTP protocol tests in the
<a href="postscreen.8.html"><b>postscreen</b>(8)</a> server.
<b><a href="postconf.5.html#postscreen_disable_vrfy_command">postscreen_disable_vrfy_command</a> ($<a href="postconf.5.html#disable_vrfy_command">disable_vrfy_command</a>)</b>
Disable the SMTP VRFY command in the <a href="postscreen.8.html"><b>postscreen</b>(8)</a>
Disable the SMTP VRFY command in the <a href="postscreen.8.html"><b>postscreen</b>(8)</a>
daemon.
<b><a href="postconf.5.html#postscreen_forbidden_commands">postscreen_forbidden_commands</a> ($<a href="postconf.5.html#smtpd_forbidden_commands">smtpd_forbidden_commands</a>)</b>
@ -237,157 +238,157 @@ POSTSCREEN(8) POSTSCREEN(8)
siders in violation of the SMTP protocol.
<b><a href="postconf.5.html#postscreen_helo_required">postscreen_helo_required</a> ($<a href="postconf.5.html#smtpd_helo_required">smtpd_helo_required</a>)</b>
Require that a remote SMTP client sends HELO or
Require that a remote SMTP client sends HELO or
EHLO before commencing a MAIL transaction.
<b><a href="postconf.5.html#postscreen_non_smtp_command_action">postscreen_non_smtp_command_action</a> (drop)</b>
The action that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> takes when an SMTP
client sends non-SMTP commands as specified with
The action that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> takes when an SMTP
client sends non-SMTP commands as specified with
the <a href="postconf.5.html#postscreen_forbidden_commands">postscreen_forbidden_commands</a> parameter.
<b><a href="postconf.5.html#postscreen_non_smtp_command_enable">postscreen_non_smtp_command_enable</a> (no)</b>
Enable "non-SMTP command" tests in the
Enable "non-SMTP command" tests in the
<a href="postscreen.8.html"><b>postscreen</b>(8)</a> server.
<b><a href="postconf.5.html#postscreen_pipelining_action">postscreen_pipelining_action</a> (enforce)</b>
The action that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> takes when an SMTP
client sends multiple commands instead of sending
one command and waiting for the server to respond.
The action that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> takes when an SMTP
client sends multiple commands instead of sending
one command and waiting for the server to respond.
<b><a href="postconf.5.html#postscreen_pipelining_enable">postscreen_pipelining_enable</a> (no)</b>
Enable "pipelining" SMTP protocol tests in the
Enable "pipelining" SMTP protocol tests in the
<a href="postscreen.8.html"><b>postscreen</b>(8)</a> server.
<b>CACHE CONTROLS</b>
<b><a href="postconf.5.html#postscreen_cache_cleanup_interval">postscreen_cache_cleanup_interval</a> (12h)</b>
The amount of time between <a href="postscreen.8.html"><b>postscreen</b>(8)</a> cache
The amount of time between <a href="postscreen.8.html"><b>postscreen</b>(8)</a> cache
cleanup runs.
<b><a href="postconf.5.html#postscreen_cache_map">postscreen_cache_map</a> (btree:$data_direc-</b>
<b>tory/postscreen_cache)</b>
Persistent storage for the <a href="postscreen.8.html"><b>postscreen</b>(8)</a> server
Persistent storage for the <a href="postscreen.8.html"><b>postscreen</b>(8)</a> server
decisions.
<b><a href="postconf.5.html#postscreen_cache_retention_time">postscreen_cache_retention_time</a> (7d)</b>
The amount of time that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> will cache an
expired temporary whitelist entry before it is
expired temporary whitelist entry before it is
removed.
<b><a href="postconf.5.html#postscreen_bare_newline_ttl">postscreen_bare_newline_ttl</a> (30d)</b>
The amount of time that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> will use the
The amount of time that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> will use the
result from a successful "bare newline" SMTP proto-
col test.
<b><a href="postconf.5.html#postscreen_dnsbl_ttl">postscreen_dnsbl_ttl</a> (1h)</b>
The amount of time that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> will use the
The amount of time that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> will use the
result from a successful DNS blocklist test.
<b><a href="postconf.5.html#postscreen_greet_ttl">postscreen_greet_ttl</a> (1d)</b>
The amount of time that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> will use the
The amount of time that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> will use the
result from a successful PREGREET test.
<b><a href="postconf.5.html#postscreen_non_smtp_command_ttl">postscreen_non_smtp_command_ttl</a> (30d)</b>
The amount of time that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> will use the
result from a successful "non_smtp_command" SMTP
The amount of time that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> will use the
result from a successful "non_smtp_command" SMTP
protocol test.
<b><a href="postconf.5.html#postscreen_pipelining_ttl">postscreen_pipelining_ttl</a> (30d)</b>
The amount of time that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> will use the
The amount of time that <a href="postscreen.8.html"><b>postscreen</b>(8)</a> will use the
result from a successful "pipelining" SMTP protocol
test.
<b>RESOURCE CONTROLS</b>
<b><a href="postconf.5.html#line_length_limit">line_length_limit</a> (2048)</b>
Upon input, long lines are chopped up into pieces
of at most this length; upon delivery, long lines
Upon input, long lines are chopped up into pieces
of at most this length; upon delivery, long lines
are reconstructed.
<b><a href="postconf.5.html#postscreen_client_connection_count_limit">postscreen_client_connection_count_limit</a></b>
<b>($<a href="postconf.5.html#smtpd_client_connection_count_limit">smtpd_client_connection_count_limit</a>)</b>
How many simultaneous connections any client is
How many simultaneous connections any client is
allowed to have with the <a href="postscreen.8.html"><b>postscreen</b>(8)</a> daemon.
<b><a href="postconf.5.html#postscreen_command_count_limit">postscreen_command_count_limit</a> (20)</b>
The limit on the total number of commands per SMTP
session for <a href="postscreen.8.html"><b>postscreen</b>(8)</a>'s built-in SMTP protocol
The limit on the total number of commands per SMTP
session for <a href="postscreen.8.html"><b>postscreen</b>(8)</a>'s built-in SMTP protocol
engine.
<b><a href="postconf.5.html#postscreen_command_time_limit">postscreen_command_time_limit</a> (${stress?10}${stress:300}s)</b>
The time limit to read an entire command line with
The time limit to read an entire command line with
<a href="postscreen.8.html"><b>postscreen</b>(8)</a>'s built-in SMTP protocol engine.
<b><a href="postconf.5.html#postscreen_post_queue_limit">postscreen_post_queue_limit</a> ($<a href="postconf.5.html#default_process_limit">default_process_limit</a>)</b>
The number of clients that can be waiting for ser-
The number of clients that can be waiting for ser-
vice from a real SMTP server process.
<b><a href="postconf.5.html#postscreen_pre_queue_limit">postscreen_pre_queue_limit</a> ($<a href="postconf.5.html#default_process_limit">default_process_limit</a>)</b>
The number of non-whitelisted clients that can be
waiting for a decision whether they will receive
The number of non-whitelisted clients that can be
waiting for a decision whether they will receive
service from a real SMTP server process.
<b><a href="postconf.5.html#postscreen_watchdog_timeout">postscreen_watchdog_timeout</a> (10s)</b>
How much time a <a href="postscreen.8.html"><b>postscreen</b>(8)</a> process may take to
respond to an SMTP client command or to perform a
How much time a <a href="postscreen.8.html"><b>postscreen</b>(8)</a> process may take to
respond to an SMTP client command or to perform a
cache operation before it is terminated by a built-
in watchdog timer.
<b>STARTTLS CONTROLS</b>
<b><a href="postconf.5.html#postscreen_tls_security_level">postscreen_tls_security_level</a> ($<a href="postconf.5.html#smtpd_tls_security_level">smtpd_tls_security_level</a>)</b>
The SMTP TLS security level for the <a href="postscreen.8.html"><b>postscreen</b>(8)</a>
server; when a non-empty value is specified, this
The SMTP TLS security level for the <a href="postscreen.8.html"><b>postscreen</b>(8)</a>
server; when a non-empty value is specified, this
overrides the obsolete parameters
<a href="postconf.5.html#postscreen_use_tls">postscreen_use_tls</a> and <a href="postconf.5.html#postscreen_enforce_tls">postscreen_enforce_tls</a>.
<b><a href="postconf.5.html#tlsproxy_service_name">tlsproxy_service_name</a> (tlsproxy)</b>
The name of the <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> service entry in mas-
The name of the <a href="tlsproxy.8.html"><b>tlsproxy</b>(8)</a> service entry in mas-
ter.cf.
<b>OBSOLETE STARTTLS SUPPORT CONTROLS</b>
These parameters are supported for compatibility with
These parameters are supported for compatibility with
<a href="smtpd.8.html"><b>smtpd</b>(8)</a> legacy parameters.
<b><a href="postconf.5.html#postscreen_use_tls">postscreen_use_tls</a> ($<a href="postconf.5.html#smtpd_use_tls">smtpd_use_tls</a>)</b>
Opportunistic TLS: announce STARTTLS support to
SMTP clients, but do not require that clients use
Opportunistic TLS: announce STARTTLS support to
SMTP clients, but do not require that clients use
TLS encryption.
<b><a href="postconf.5.html#postscreen_enforce_tls">postscreen_enforce_tls</a> ($<a href="postconf.5.html#smtpd_enforce_tls">smtpd_enforce_tls</a>)</b>
Mandatory TLS: announce STARTTLS support to SMTP
clients, and require that clients use TLS encryp-
Mandatory TLS: announce STARTTLS support to SMTP
clients, and require that clients use TLS encryp-
tion.
<b>MISCELLANEOUS CONTROLS</b>
<b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b>
The default location of the Postfix <a href="postconf.5.html">main.cf</a> and
The default location of the Postfix <a href="postconf.5.html">main.cf</a> and
<a href="master.5.html">master.cf</a> configuration files.
<b><a href="postconf.5.html#delay_logging_resolution_limit">delay_logging_resolution_limit</a> (2)</b>
The maximal number of digits after the decimal
The maximal number of digits after the decimal
point when logging sub-second delay values.
<b><a href="postconf.5.html#command_directory">command_directory</a> (see 'postconf -d' output)</b>
The location of all postfix administrative com-
The location of all postfix administrative com-
mands.
<b><a href="postconf.5.html#max_idle">max_idle</a> (100s)</b>
The maximum amount of time that an idle Postfix
daemon process waits for an incoming connection
The maximum amount of time that an idle Postfix
daemon process waits for an incoming connection
before terminating voluntarily.
<b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b>
The process ID of a Postfix command or daemon
The process ID of a Postfix command or daemon
process.
<b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b>
The process name of a Postfix command or daemon
The process name of a Postfix command or daemon
process.
<b><a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)</b>
The syslog facility of Postfix logging.
<b><a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)</b>
The mail system name that is prepended to the
process name in syslog records, so that "smtpd"
The mail system name that is prepended to the
process name in syslog records, so that "smtpd"
becomes, for example, "postfix/smtpd".
<b>SEE ALSO</b>
@ -400,14 +401,14 @@ POSTSCREEN(8) POSTSCREEN(8)
<a href="POSTSCREEN_README.html">POSTSCREEN_README</a>, Postfix Postscreen Howto
<b>LICENSE</b>
The Secure Mailer license must be distributed with this
The Secure Mailer license must be distributed with this
software.
<b>HISTORY</b>
This service was introduced with Postfix version 2.8.
Many ideas in <a href="postscreen.8.html"><b>postscreen</b>(8)</a> were explored in earlier work
by Michael Tokarev, in OpenBSD spamd, and in MailChannels
Many ideas in <a href="postscreen.8.html"><b>postscreen</b>(8)</a> were explored in earlier work
by Michael Tokarev, in OpenBSD spamd, and in MailChannels
Traffic Control.
<b>AUTHOR(S)</b>

214
postfix/html/smtp.8.html
View File

@ -295,11 +295,21 @@ SMTP(8) SMTP(8)
<b><a href="postconf.5.html#smtp_dns_resolver_options">smtp_dns_resolver_options</a> (empty)</b>
DNS Resolver options for the Postfix SMTP client.
Available in Postfix version 2.9 and later:
<b><a href="postconf.5.html#smtp_per_record_deadline">smtp_per_record_deadline</a> (no)</b>
Change the behavior of the smtp_*_timeout time lim-
its, from a time limit per read or write system
call, to a time limit to read or write a complete
record (an SMTP command line, SMTP response line,
SMTP message content line, or TLS protocol mes-
sage).
<b>MIME PROCESSING CONTROLS</b>
Available in Postfix version 2.0 and later:
<b><a href="postconf.5.html#disable_mime_output_conversion">disable_mime_output_conversion</a> (no)</b>
Disable the conversion of 8BITMIME format to 7BIT
Disable the conversion of 8BITMIME format to 7BIT
format.
<b><a href="postconf.5.html#mime_boundary_length_limit">mime_boundary_length_limit</a> (2048)</b>
@ -314,108 +324,108 @@ SMTP(8) SMTP(8)
Available in Postfix version 2.1 and later:
<b><a href="postconf.5.html#smtp_send_xforward_command">smtp_send_xforward_command</a> (no)</b>
Send the non-standard XFORWARD command when the
Postfix SMTP server EHLO response announces XFOR-
Send the non-standard XFORWARD command when the
Postfix SMTP server EHLO response announces XFOR-
WARD support.
<b>SASL AUTHENTICATION CONTROLS</b>
<b><a href="postconf.5.html#smtp_sasl_auth_enable">smtp_sasl_auth_enable</a> (no)</b>
Enable SASL authentication in the Postfix SMTP
Enable SASL authentication in the Postfix SMTP
client.
<b><a href="postconf.5.html#smtp_sasl_password_maps">smtp_sasl_password_maps</a> (empty)</b>
Optional SMTP client lookup tables with one user-
name:password entry per remote hostname or domain,
Optional SMTP client lookup tables with one user-
name:password entry per remote hostname or domain,
or sender address when sender-dependent authentica-
tion is enabled.
<b><a href="postconf.5.html#smtp_sasl_security_options">smtp_sasl_security_options</a> (noplaintext, noanonymous)</b>
Postfix SMTP client SASL security options; as of
Postfix 2.3 the list of available features depends
on the SASL client implementation that is selected
Postfix SMTP client SASL security options; as of
Postfix 2.3 the list of available features depends
on the SASL client implementation that is selected
with <b><a href="postconf.5.html#smtp_sasl_type">smtp_sasl_type</a></b>.
Available in Postfix version 2.2 and later:
<b><a href="postconf.5.html#smtp_sasl_mechanism_filter">smtp_sasl_mechanism_filter</a> (empty)</b>
If non-empty, a Postfix SMTP client filter for the
remote SMTP server's list of offered SASL mecha-
If non-empty, a Postfix SMTP client filter for the
remote SMTP server's list of offered SASL mecha-
nisms.
Available in Postfix version 2.3 and later:
<b><a href="postconf.5.html#smtp_sender_dependent_authentication">smtp_sender_dependent_authentication</a> (no)</b>
Enable sender-dependent authentication in the Post-
fix SMTP client; this is available only with SASL
authentication, and disables SMTP connection
caching to ensure that mail from different senders
fix SMTP client; this is available only with SASL
authentication, and disables SMTP connection
caching to ensure that mail from different senders
will use the appropriate credentials.
<b><a href="postconf.5.html#smtp_sasl_path">smtp_sasl_path</a> (empty)</b>
Implementation-specific information that the Post-
fix SMTP client passes through to the SASL plug-in
implementation that is selected with
Implementation-specific information that the Post-
fix SMTP client passes through to the SASL plug-in
implementation that is selected with
<b><a href="postconf.5.html#smtp_sasl_type">smtp_sasl_type</a></b>.
<b><a href="postconf.5.html#smtp_sasl_type">smtp_sasl_type</a> (cyrus)</b>
The SASL plug-in type that the Postfix SMTP client
The SASL plug-in type that the Postfix SMTP client
should use for authentication.
Available in Postfix version 2.5 and later:
<b><a href="postconf.5.html#smtp_sasl_auth_cache_name">smtp_sasl_auth_cache_name</a> (empty)</b>
An optional table to prevent repeated SASL authen-
tication failures with the same remote SMTP server
An optional table to prevent repeated SASL authen-
tication failures with the same remote SMTP server
hostname, username and password.
<b><a href="postconf.5.html#smtp_sasl_auth_cache_time">smtp_sasl_auth_cache_time</a> (90d)</b>
The maximal age of an <a href="postconf.5.html#smtp_sasl_auth_cache_name">smtp_sasl_auth_cache_name</a>
The maximal age of an <a href="postconf.5.html#smtp_sasl_auth_cache_name">smtp_sasl_auth_cache_name</a>
entry before it is removed.
<b><a href="postconf.5.html#smtp_sasl_auth_soft_bounce">smtp_sasl_auth_soft_bounce</a> (yes)</b>
When a remote SMTP server rejects a SASL authenti-
cation request with a 535 reply code, defer mail
delivery instead of returning mail as undeliver-
When a remote SMTP server rejects a SASL authenti-
cation request with a 535 reply code, defer mail
delivery instead of returning mail as undeliver-
able.
<b>STARTTLS SUPPORT CONTROLS</b>
Detailed information about STARTTLS configuration may be
Detailed information about STARTTLS configuration may be
found in the <a href="TLS_README.html">TLS_README</a> document.
<b><a href="postconf.5.html#smtp_tls_security_level">smtp_tls_security_level</a> (empty)</b>
The default SMTP TLS security level for the Postfix
SMTP client; when a non-empty value is specified,
this overrides the obsolete parameters
SMTP client; when a non-empty value is specified,
this overrides the obsolete parameters
<a href="postconf.5.html#smtp_use_tls">smtp_use_tls</a>, <a href="postconf.5.html#smtp_enforce_tls">smtp_enforce_tls</a>, and
<a href="postconf.5.html#smtp_tls_enforce_peername">smtp_tls_enforce_peername</a>.
<b><a href="postconf.5.html#smtp_sasl_tls_security_options">smtp_sasl_tls_security_options</a> ($<a href="postconf.5.html#smtp_sasl_security_options">smtp_sasl_secu</a>-</b>
<b><a href="postconf.5.html#smtp_sasl_security_options">rity_options</a>)</b>
The SASL authentication security options that the
Postfix SMTP client uses for TLS encrypted SMTP
The SASL authentication security options that the
Postfix SMTP client uses for TLS encrypted SMTP
sessions.
<b><a href="postconf.5.html#smtp_starttls_timeout">smtp_starttls_timeout</a> (300s)</b>
Time limit for Postfix SMTP client write and read
operations during TLS startup and shutdown hand-
Time limit for Postfix SMTP client write and read
operations during TLS startup and shutdown hand-
shake procedures.
<b><a href="postconf.5.html#smtp_tls_CAfile">smtp_tls_CAfile</a> (empty)</b>
A file containing CA certificates of root CAs
trusted to sign either remote SMTP server certifi-
A file containing CA certificates of root CAs
trusted to sign either remote SMTP server certifi-
cates or intermediate CA certificates.
<b><a href="postconf.5.html#smtp_tls_CApath">smtp_tls_CApath</a> (empty)</b>
Directory with PEM format certificate authority
certificates that the Postfix SMTP client uses to
Directory with PEM format certificate authority
certificates that the Postfix SMTP client uses to
verify a remote SMTP server certificate.
<b><a href="postconf.5.html#smtp_tls_cert_file">smtp_tls_cert_file</a> (empty)</b>
File with the Postfix SMTP client RSA certificate
File with the Postfix SMTP client RSA certificate
in PEM format.
<b><a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a> (medium)</b>
The minimum TLS cipher grade that the Postfix SMTP
The minimum TLS cipher grade that the Postfix SMTP
client will use with mandatory TLS encryption.
<b><a href="postconf.5.html#smtp_tls_exclude_ciphers">smtp_tls_exclude_ciphers</a> (empty)</b>
@ -424,43 +434,43 @@ SMTP(8) SMTP(8)
levels.
<b><a href="postconf.5.html#smtp_tls_mandatory_exclude_ciphers">smtp_tls_mandatory_exclude_ciphers</a> (empty)</b>
Additional list of ciphers or cipher types to
exclude from the SMTP client cipher list at manda-
Additional list of ciphers or cipher types to
exclude from the SMTP client cipher list at manda-
tory TLS security levels.
<b><a href="postconf.5.html#smtp_tls_dcert_file">smtp_tls_dcert_file</a> (empty)</b>
File with the Postfix SMTP client DSA certificate
File with the Postfix SMTP client DSA certificate
in PEM format.
<b><a href="postconf.5.html#smtp_tls_dkey_file">smtp_tls_dkey_file</a> ($<a href="postconf.5.html#smtp_tls_dcert_file">smtp_tls_dcert_file</a>)</b>
File with the Postfix SMTP client DSA private key
File with the Postfix SMTP client DSA private key
in PEM format.
<b><a href="postconf.5.html#smtp_tls_key_file">smtp_tls_key_file</a> ($<a href="postconf.5.html#smtp_tls_cert_file">smtp_tls_cert_file</a>)</b>
File with the Postfix SMTP client RSA private key
File with the Postfix SMTP client RSA private key
in PEM format.
<b><a href="postconf.5.html#smtp_tls_loglevel">smtp_tls_loglevel</a> (0)</b>
Enable additional Postfix SMTP client logging of
Enable additional Postfix SMTP client logging of
TLS activity.
<b><a href="postconf.5.html#smtp_tls_note_starttls_offer">smtp_tls_note_starttls_offer</a> (no)</b>
Log the hostname of a remote SMTP server that
offers STARTTLS, when TLS is not already enabled
Log the hostname of a remote SMTP server that
offers STARTTLS, when TLS is not already enabled
for that server.
<b><a href="postconf.5.html#smtp_tls_policy_maps">smtp_tls_policy_maps</a> (empty)</b>
Optional lookup tables with the Postfix SMTP client
TLS security policy by next-hop destination; when a
non-empty value is specified, this overrides the
non-empty value is specified, this overrides the
obsolete <a href="postconf.5.html#smtp_tls_per_site">smtp_tls_per_site</a> parameter.
<b><a href="postconf.5.html#smtp_tls_mandatory_protocols">smtp_tls_mandatory_protocols</a> (SSLv3, TLSv1)</b>
List of SSL/TLS protocols that the Postfix SMTP
List of SSL/TLS protocols that the Postfix SMTP
client will use with mandatory TLS encryption.
<b><a href="postconf.5.html#smtp_tls_scert_verifydepth">smtp_tls_scert_verifydepth</a> (9)</b>
The verification depth for remote SMTP server cer-
The verification depth for remote SMTP server cer-
tificates.
<b><a href="postconf.5.html#smtp_tls_secure_cert_match">smtp_tls_secure_cert_match</a> (nexthop, dot-nexthop)</b>
@ -468,7 +478,7 @@ SMTP(8) SMTP(8)
for the "secure" TLS security level.
<b><a href="postconf.5.html#smtp_tls_session_cache_database">smtp_tls_session_cache_database</a> (empty)</b>
Name of the file containing the optional Postfix
Name of the file containing the optional Postfix
SMTP client TLS session cache.
<b><a href="postconf.5.html#smtp_tls_session_cache_timeout">smtp_tls_session_cache_timeout</a> (3600s)</b>
@ -480,9 +490,9 @@ SMTP(8) SMTP(8)
for the "verify" TLS security level.
<b><a href="postconf.5.html#tls_daemon_random_bytes">tls_daemon_random_bytes</a> (32)</b>
The number of pseudo-random bytes that an <a href="smtp.8.html"><b>smtp</b>(8)</a>
or <a href="smtpd.8.html"><b>smtpd</b>(8)</a> process requests from the <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a>
server in order to seed its internal pseudo random
The number of pseudo-random bytes that an <a href="smtp.8.html"><b>smtp</b>(8)</a>
or <a href="smtpd.8.html"><b>smtpd</b>(8)</a> process requests from the <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a>
server in order to seed its internal pseudo random
number generator (PRNG).
<b><a href="postconf.5.html#tls_high_cipherlist">tls_high_cipherlist</a></b>
@ -494,7 +504,7 @@ SMTP(8) SMTP(8)
ciphers.
<b><a href="postconf.5.html#tls_low_cipherlist">tls_low_cipherlist</a> (ALL:!EXPORT:+RC4:@STRENGTH)</b>
The OpenSSL cipherlist for "LOW" or higher grade
The OpenSSL cipherlist for "LOW" or higher grade
ciphers.
<b><a href="postconf.5.html#tls_export_cipherlist">tls_export_cipherlist</a> (ALL:+RC4:@STRENGTH)</b>
@ -502,38 +512,38 @@ SMTP(8) SMTP(8)
ciphers.
<b><a href="postconf.5.html#tls_null_cipherlist">tls_null_cipherlist</a> (eNULL:!aNULL)</b>
The OpenSSL cipherlist for "NULL" grade ciphers
The OpenSSL cipherlist for "NULL" grade ciphers
that provide authentication without encryption.
Available in Postfix version 2.4 and later:
<b><a href="postconf.5.html#smtp_sasl_tls_verified_security_options">smtp_sasl_tls_verified_security_options</a></b>
<b>($<a href="postconf.5.html#smtp_sasl_tls_security_options">smtp_sasl_tls_security_options</a>)</b>
The SASL authentication security options that the
Postfix SMTP client uses for TLS encrypted SMTP
The SASL authentication security options that the
Postfix SMTP client uses for TLS encrypted SMTP
sessions with a verified server certificate.
Available in Postfix version 2.5 and later:
<b><a href="postconf.5.html#smtp_tls_fingerprint_cert_match">smtp_tls_fingerprint_cert_match</a> (empty)</b>
List of acceptable remote SMTP server certificate
fingerprints for the "fingerprint" TLS security
List of acceptable remote SMTP server certificate
fingerprints for the "fingerprint" TLS security
level (<b><a href="postconf.5.html#smtp_tls_security_level">smtp_tls_security_level</a></b> = fingerprint).
<b><a href="postconf.5.html#smtp_tls_fingerprint_digest">smtp_tls_fingerprint_digest</a> (md5)</b>
The message digest algorithm used to construct
The message digest algorithm used to construct
remote SMTP server certificate fingerprints.
Available in Postfix version 2.6 and later:
<b><a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a> (!SSLv2)</b>
List of TLS protocols that the Postfix SMTP client
will exclude or include with opportunistic TLS
List of TLS protocols that the Postfix SMTP client
will exclude or include with opportunistic TLS
encryption.
<b><a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a> (export)</b>
The minimum TLS cipher grade that the Postfix SMTP
client will use with opportunistic TLS encryption.
The minimum TLS cipher grade that the Postfix SMTP
client will use with opportunistic TLS encryption.
<b><a href="postconf.5.html#smtp_tls_eccert_file">smtp_tls_eccert_file</a> (empty)</b>
File with the Postfix SMTP client ECDSA certificate
@ -546,40 +556,40 @@ SMTP(8) SMTP(8)
Available in Postfix version 2.7 and later:
<b><a href="postconf.5.html#smtp_tls_block_early_mail_reply">smtp_tls_block_early_mail_reply</a> (no)</b>
Try to detect a mail hijacking attack based on a
TLS protocol vulnerability (CVE-2009-3555), where
an attacker prepends malicious HELO, MAIL, RCPT,
Try to detect a mail hijacking attack based on a
TLS protocol vulnerability (CVE-2009-3555), where
an attacker prepends malicious HELO, MAIL, RCPT,
DATA commands to a Postfix SMTP client TLS session.
Available in Postfix version 2.8 and later:
<b><a href="postconf.5.html#tls_disable_workarounds">tls_disable_workarounds</a> (see 'postconf -d' output)</b>
List or bit-mask of OpenSSL bug work-arounds to
List or bit-mask of OpenSSL bug work-arounds to
disable.
<b>OBSOLETE STARTTLS CONTROLS</b>
The following configuration parameters exist for compati-
The following configuration parameters exist for compati-
bility with Postfix versions before 2.3. Support for these
will be removed in a future release.
<b><a href="postconf.5.html#smtp_use_tls">smtp_use_tls</a> (no)</b>
Opportunistic mode: use TLS when a remote SMTP
server announces STARTTLS support, otherwise send
Opportunistic mode: use TLS when a remote SMTP
server announces STARTTLS support, otherwise send
the mail in the clear.
<b><a href="postconf.5.html#smtp_enforce_tls">smtp_enforce_tls</a> (no)</b>
Enforcement mode: require that remote SMTP servers
use TLS encryption, and never send mail in the
Enforcement mode: require that remote SMTP servers
use TLS encryption, and never send mail in the
clear.
<b><a href="postconf.5.html#smtp_tls_enforce_peername">smtp_tls_enforce_peername</a> (yes)</b>
With mandatory TLS encryption, require that the
With mandatory TLS encryption, require that the
remote SMTP server hostname matches the information
in the remote SMTP server certificate.
<b><a href="postconf.5.html#smtp_tls_per_site">smtp_tls_per_site</a> (empty)</b>
Optional lookup tables with the Postfix SMTP client
TLS usage policy by next-hop destination and by
TLS usage policy by next-hop destination and by
remote SMTP server hostname.
<b><a href="postconf.5.html#smtp_tls_cipherlist">smtp_tls_cipherlist</a> (empty)</b>
@ -589,27 +599,27 @@ SMTP(8) SMTP(8)
<b>RESOURCE AND RATE CONTROLS</b>
<b><a href="postconf.5.html#smtp_destination_concurrency_limit">smtp_destination_concurrency_limit</a> ($<a href="postconf.5.html#default_destination_concurrency_limit">default_destina</a>-</b>
<b><a href="postconf.5.html#default_destination_concurrency_limit">tion_concurrency_limit</a>)</b>
The maximal number of parallel deliveries to the
same destination via the smtp message delivery
The maximal number of parallel deliveries to the
same destination via the smtp message delivery
transport.
<b><a href="postconf.5.html#smtp_destination_recipient_limit">smtp_destination_recipient_limit</a> ($<a href="postconf.5.html#default_destination_recipient_limit">default_destina</a>-</b>
<b><a href="postconf.5.html#default_destination_recipient_limit">tion_recipient_limit</a>)</b>
The maximal number of recipients per message for
The maximal number of recipients per message for
the smtp message delivery transport.
<b><a href="postconf.5.html#smtp_connect_timeout">smtp_connect_timeout</a> (30s)</b>
The SMTP client time limit for completing a TCP
The SMTP client time limit for completing a TCP
connection, or zero (use the operating system
built-in time limit).
<b><a href="postconf.5.html#smtp_helo_timeout">smtp_helo_timeout</a> (300s)</b>
The SMTP client time limit for sending the HELO or
EHLO command, and for receiving the initial server
The SMTP client time limit for sending the HELO or
EHLO command, and for receiving the initial server
response.
<b><a href="postconf.5.html#lmtp_lhlo_timeout">lmtp_lhlo_timeout</a> (300s)</b>
The LMTP client time limit for sending the LHLO
The LMTP client time limit for sending the LHLO
command, and for receiving the initial server
response.
@ -618,30 +628,30 @@ SMTP(8) SMTP(8)
command, and for receiving the server response.
<b><a href="postconf.5.html#smtp_mail_timeout">smtp_mail_timeout</a> (300s)</b>
The SMTP client time limit for sending the MAIL
FROM command, and for receiving the server
The SMTP client time limit for sending the MAIL
FROM command, and for receiving the server
response.
<b><a href="postconf.5.html#smtp_rcpt_timeout">smtp_rcpt_timeout</a> (300s)</b>
The SMTP client time limit for sending the SMTP
RCPT TO command, and for receiving the server
The SMTP client time limit for sending the SMTP
RCPT TO command, and for receiving the server
response.
<b><a href="postconf.5.html#smtp_data_init_timeout">smtp_data_init_timeout</a> (120s)</b>
The SMTP client time limit for sending the SMTP
DATA command, and for receiving the server
The SMTP client time limit for sending the SMTP
DATA command, and for receiving the server
response.
<b><a href="postconf.5.html#smtp_data_xfer_timeout">smtp_data_xfer_timeout</a> (180s)</b>
The SMTP client time limit for sending the SMTP
The SMTP client time limit for sending the SMTP
message content.
<b><a href="postconf.5.html#smtp_data_done_timeout">smtp_data_done_timeout</a> (600s)</b>
The SMTP client time limit for sending the SMTP
The SMTP client time limit for sending the SMTP
".", and for receiving the server response.
<b><a href="postconf.5.html#smtp_quit_timeout">smtp_quit_timeout</a> (300s)</b>
The SMTP client time limit for sending the QUIT
The SMTP client time limit for sending the QUIT
command, and for receiving the server response.
Available in Postfix version 2.1 and later:
@ -652,12 +662,12 @@ SMTP(8) SMTP(8)
lookups, or zero (no limit).
<b><a href="postconf.5.html#smtp_mx_session_limit">smtp_mx_session_limit</a> (2)</b>
The maximal number of SMTP sessions per delivery
request before giving up or delivering to a fall-
The maximal number of SMTP sessions per delivery
request before giving up or delivering to a fall-
back <a href="postconf.5.html#relayhost">relay host</a>, or zero (no limit).
<b><a href="postconf.5.html#smtp_rset_timeout">smtp_rset_timeout</a> (20s)</b>
The SMTP client time limit for sending the RSET
The SMTP client time limit for sending the RSET
command, and for receiving the server response.
Available in Postfix version 2.2 and earlier:
@ -669,11 +679,11 @@ SMTP(8) SMTP(8)
Available in Postfix version 2.2 and later:
<b><a href="postconf.5.html#smtp_connection_cache_destinations">smtp_connection_cache_destinations</a> (empty)</b>
Permanently enable SMTP connection caching for the
Permanently enable SMTP connection caching for the
specified destinations.
<b><a href="postconf.5.html#smtp_connection_cache_on_demand">smtp_connection_cache_on_demand</a> (yes)</b>
Temporarily enable SMTP connection caching while a
Temporarily enable SMTP connection caching while a
destination has a high volume of mail in the active
queue.
@ -683,15 +693,25 @@ SMTP(8) SMTP(8)
<b><a href="postconf.5.html#smtp_connection_cache_time_limit">smtp_connection_cache_time_limit</a> (2s)</b>
When SMTP connection caching is enabled, the amount
of time that an unused SMTP client socket is kept
of time that an unused SMTP client socket is kept
open before it is closed.
Available in Postfix version 2.3 and later:
<b><a href="postconf.5.html#connection_cache_protocol_timeout">connection_cache_protocol_timeout</a> (5s)</b>
Time limit for connection cache connect, send or
Time limit for connection cache connect, send or
receive operations.
Available in Postfix version 2.9 and later:
<b><a href="postconf.5.html#smtp_per_record_deadline">smtp_per_record_deadline</a> (no)</b>
Change the behavior of the smtp_*_timeout time lim-
its, from a time limit per read or write system
call, to a time limit to read or write a complete
record (an SMTP command line, SMTP response line,
SMTP message content line, or TLS protocol mes-
sage).
<b>TROUBLE SHOOTING CONTROLS</b>
<b><a href="postconf.5.html#debug_peer_level">debug_peer_level</a> (2)</b>
The increment in verbose logging level when a

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postfix/html/smtpd.8.html
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@ -153,46 +153,56 @@ SMTPD(8) SMTPD(8)
A mechanism to transform commands from remote SMTP
clients.
Available in Postfix version 2.9 and later:
<b><a href="postconf.5.html#smtpd_per_record_deadline">smtpd_per_record_deadline</a> (normal: no, overload: yes)</b>
Change the behavior of the <a href="postconf.5.html#smtpd_timeout">smtpd_timeout</a> time
limit, from a time limit per read or write system
call, to a time limit to read or write a complete
record (an SMTP command line, SMTP response line,
SMTP message content line, or TLS protocol mes-
sage).
<b>ADDRESS REWRITING CONTROLS</b>
See the <a href="ADDRESS_REWRITING_README.html">ADDRESS_REWRITING_README</a> document for a detailed
See the <a href="ADDRESS_REWRITING_README.html">ADDRESS_REWRITING_README</a> document for a detailed
discussion of Postfix address rewriting.
<b><a href="postconf.5.html#receive_override_options">receive_override_options</a> (empty)</b>
Enable or disable recipient validation, built-in
Enable or disable recipient validation, built-in
content filtering, or address mapping.
Available in Postfix version 2.2 and later:
<b><a href="postconf.5.html#local_header_rewrite_clients">local_header_rewrite_clients</a> (<a href="postconf.5.html#permit_inet_interfaces">permit_inet_interfaces</a>)</b>
Rewrite message header addresses in mail from these
clients and update incomplete addresses with the
clients and update incomplete addresses with the
domain name in $<a href="postconf.5.html#myorigin">myorigin</a> or $<a href="postconf.5.html#mydomain">mydomain</a>; either don't
rewrite message headers from other clients at all,
or rewrite message headers and update incomplete
addresses with the domain specified in the
rewrite message headers from other clients at all,
or rewrite message headers and update incomplete
addresses with the domain specified in the
<a href="postconf.5.html#remote_header_rewrite_domain">remote_header_rewrite_domain</a> parameter.
<b>AFTER QUEUE EXTERNAL CONTENT INSPECTION CONTROLS</b>
As of version 1.0, Postfix can be configured to send new
mail to an external content filter AFTER the mail is
queued. This content filter is expected to inject mail
back into a (Postfix or other) MTA for further delivery.
As of version 1.0, Postfix can be configured to send new
mail to an external content filter AFTER the mail is
queued. This content filter is expected to inject mail
back into a (Postfix or other) MTA for further delivery.
See the <a href="FILTER_README.html">FILTER_README</a> document for details.
<b><a href="postconf.5.html#content_filter">content_filter</a> (empty)</b>
After the message is queued, send the entire mes-
After the message is queued, send the entire mes-
sage to the specified <i>transport:destination</i>.
<b>BEFORE QUEUE EXTERNAL CONTENT INSPECTION CONTROLS</b>
As of version 2.1, the Postfix SMTP server can be config-
ured to send incoming mail to a real-time SMTP-based con-
As of version 2.1, the Postfix SMTP server can be config-
ured to send incoming mail to a real-time SMTP-based con-
tent filter BEFORE mail is queued. This content filter is
expected to inject mail back into Postfix. See the
<a href="SMTPD_PROXY_README.html">SMTPD_PROXY_README</a> document for details on how to config-
expected to inject mail back into Postfix. See the
<a href="SMTPD_PROXY_README.html">SMTPD_PROXY_README</a> document for details on how to config-
ure and operate this feature.
<b><a href="postconf.5.html#smtpd_proxy_filter">smtpd_proxy_filter</a> (empty)</b>
The hostname and TCP port of the mail filtering
The hostname and TCP port of the mail filtering
proxy server.
<b><a href="postconf.5.html#smtpd_proxy_ehlo">smtpd_proxy_ehlo</a> ($<a href="postconf.5.html#myhostname">myhostname</a>)</b>
@ -200,8 +210,8 @@ SMTPD(8) SMTPD(8)
proxy filter.
<b><a href="postconf.5.html#smtpd_proxy_options">smtpd_proxy_options</a> (empty)</b>
List of options that control how the Postfix SMTP
server communicates with a before-queue content
List of options that control how the Postfix SMTP
server communicates with a before-queue content
filter.
<b><a href="postconf.5.html#smtpd_proxy_timeout">smtpd_proxy_timeout</a> (100s)</b>
@ -210,24 +220,24 @@ SMTPD(8) SMTPD(8)
<b>BEFORE QUEUE MILTER CONTROLS</b>
As of version 2.3, Postfix supports the Sendmail version 8
Milter (mail filter) protocol. These content filters run
outside Postfix. They can inspect the SMTP command stream
and the message content, and can request modifications
before mail is queued. For details see the <a href="MILTER_README.html">MILTER_README</a>
Milter (mail filter) protocol. These content filters run
outside Postfix. They can inspect the SMTP command stream
and the message content, and can request modifications
before mail is queued. For details see the <a href="MILTER_README.html">MILTER_README</a>
document.
<b><a href="postconf.5.html#smtpd_milters">smtpd_milters</a> (empty)</b>
A list of Milter (mail filter) applications for new
mail that arrives via the Postfix <a href="smtpd.8.html"><b>smtpd</b>(8)</a> server.
mail that arrives via the Postfix <a href="smtpd.8.html"><b>smtpd</b>(8)</a> server.
<b><a href="postconf.5.html#milter_protocol">milter_protocol</a> (6)</b>
The mail filter protocol version and optional pro-
tocol extensions for communication with a Milter
application; prior to Postfix 2.6 the default pro-
The mail filter protocol version and optional pro-
tocol extensions for communication with a Milter
application; prior to Postfix 2.6 the default pro-
tocol is 2.
<b><a href="postconf.5.html#milter_default_action">milter_default_action</a> (tempfail)</b>
The default action when a Milter (mail filter)
The default action when a Milter (mail filter)
application is unavailable or mis-configured.
<b><a href="postconf.5.html#milter_macro_daemon_name">milter_macro_daemon_name</a> ($<a href="postconf.5.html#myhostname">myhostname</a>)</b>
@ -239,190 +249,190 @@ SMTPD(8) SMTPD(8)
cations.
<b><a href="postconf.5.html#milter_connect_timeout">milter_connect_timeout</a> (30s)</b>
The time limit for connecting to a Milter (mail
filter) application, and for negotiating protocol
The time limit for connecting to a Milter (mail
filter) application, and for negotiating protocol
options.
<b><a href="postconf.5.html#milter_command_timeout">milter_command_timeout</a> (30s)</b>
The time limit for sending an SMTP command to a
The time limit for sending an SMTP command to a
Milter (mail filter) application, and for receiving
the response.
<b><a href="postconf.5.html#milter_content_timeout">milter_content_timeout</a> (300s)</b>
The time limit for sending message content to a
The time limit for sending message content to a
Milter (mail filter) application, and for receiving
the response.
<b><a href="postconf.5.html#milter_connect_macros">milter_connect_macros</a> (see 'postconf -d' output)</b>
The macros that are sent to Milter (mail filter)
applications after completion of an SMTP connec-
The macros that are sent to Milter (mail filter)
applications after completion of an SMTP connec-
tion.
<b><a href="postconf.5.html#milter_helo_macros">milter_helo_macros</a> (see 'postconf -d' output)</b>
The macros that are sent to Milter (mail filter)
The macros that are sent to Milter (mail filter)
applications after the SMTP HELO or EHLO command.
<b><a href="postconf.5.html#milter_mail_macros">milter_mail_macros</a> (see 'postconf -d' output)</b>
The macros that are sent to Milter (mail filter)
The macros that are sent to Milter (mail filter)
applications after the SMTP MAIL FROM command.
<b><a href="postconf.5.html#milter_rcpt_macros">milter_rcpt_macros</a> (see 'postconf -d' output)</b>
The macros that are sent to Milter (mail filter)
The macros that are sent to Milter (mail filter)
applications after the SMTP RCPT TO command.
<b><a href="postconf.5.html#milter_data_macros">milter_data_macros</a> (see 'postconf -d' output)</b>
The macros that are sent to version 4 or higher
Milter (mail filter) applications after the SMTP
The macros that are sent to version 4 or higher
Milter (mail filter) applications after the SMTP
DATA command.
<b><a href="postconf.5.html#milter_unknown_command_macros">milter_unknown_command_macros</a> (see 'postconf -d' output)</b>
The macros that are sent to version 3 or higher
Milter (mail filter) applications after an unknown
The macros that are sent to version 3 or higher
Milter (mail filter) applications after an unknown
SMTP command.
<b><a href="postconf.5.html#milter_end_of_header_macros">milter_end_of_header_macros</a> (see 'postconf -d' output)</b>
The macros that are sent to Milter (mail filter)
The macros that are sent to Milter (mail filter)
applications after the end of the message header.
<b><a href="postconf.5.html#milter_end_of_data_macros">milter_end_of_data_macros</a> (see 'postconf -d' output)</b>
The macros that are sent to Milter (mail filter)
The macros that are sent to Milter (mail filter)
applications after the message end-of-data.
<b>GENERAL CONTENT INSPECTION CONTROLS</b>
The following parameters are applicable for both built-in
The following parameters are applicable for both built-in
and external content filters.
Available in Postfix version 2.1 and later:
<b><a href="postconf.5.html#receive_override_options">receive_override_options</a> (empty)</b>
Enable or disable recipient validation, built-in
Enable or disable recipient validation, built-in
content filtering, or address mapping.
<b>EXTERNAL CONTENT INSPECTION CONTROLS</b>
The following parameters are applicable for both before-
The following parameters are applicable for both before-
queue and after-queue content filtering.
Available in Postfix version 2.1 and later:
<b><a href="postconf.5.html#smtpd_authorized_xforward_hosts">smtpd_authorized_xforward_hosts</a> (empty)</b>
What SMTP clients are allowed to use the XFORWARD
What SMTP clients are allowed to use the XFORWARD
feature.
<b>SASL AUTHENTICATION CONTROLS</b>
Postfix SASL support (<a href="http://tools.ietf.org/html/rfc4954">RFC 4954</a>) can be used to authenti-
cate remote SMTP clients to the Postfix SMTP server, and
to authenticate the Postfix SMTP client to a remote SMTP
Postfix SASL support (<a href="http://tools.ietf.org/html/rfc4954">RFC 4954</a>) can be used to authenti-
cate remote SMTP clients to the Postfix SMTP server, and
to authenticate the Postfix SMTP client to a remote SMTP
server. See the <a href="SASL_README.html">SASL_README</a> document for details.
<b><a href="postconf.5.html#broken_sasl_auth_clients">broken_sasl_auth_clients</a> (no)</b>
Enable inter-operability with SMTP clients that
implement an obsolete version of the AUTH command
Enable inter-operability with SMTP clients that
implement an obsolete version of the AUTH command
(<a href="http://tools.ietf.org/html/rfc4954">RFC 4954</a>).
<b><a href="postconf.5.html#smtpd_sasl_auth_enable">smtpd_sasl_auth_enable</a> (no)</b>
Enable SASL authentication in the Postfix SMTP
Enable SASL authentication in the Postfix SMTP
server.
<b><a href="postconf.5.html#smtpd_sasl_local_domain">smtpd_sasl_local_domain</a> (empty)</b>
The name of the Postfix SMTP server's local SASL
The name of the Postfix SMTP server's local SASL
authentication realm.
<b><a href="postconf.5.html#smtpd_sasl_security_options">smtpd_sasl_security_options</a> (noanonymous)</b>
Postfix SMTP server SASL security options; as of
Postfix 2.3 the list of available features depends
on the SASL server implementation that is selected
Postfix SMTP server SASL security options; as of
Postfix 2.3 the list of available features depends
on the SASL server implementation that is selected
with <b><a href="postconf.5.html#smtpd_sasl_type">smtpd_sasl_type</a></b>.
<b><a href="postconf.5.html#smtpd_sender_login_maps">smtpd_sender_login_maps</a> (empty)</b>
Optional lookup table with the SASL login names
Optional lookup table with the SASL login names
that own sender (MAIL FROM) addresses.
Available in Postfix version 2.1 and later:
<b><a href="postconf.5.html#smtpd_sasl_exceptions_networks">smtpd_sasl_exceptions_networks</a> (empty)</b>
What remote SMTP clients the Postfix SMTP server
What remote SMTP clients the Postfix SMTP server
will not offer AUTH support to.
Available in Postfix version 2.1 and 2.2:
<b><a href="postconf.5.html#smtpd_sasl_application_name">smtpd_sasl_application_name</a> (smtpd)</b>
The application name that the Postfix SMTP server
The application name that the Postfix SMTP server
uses for SASL server initialization.
Available in Postfix version 2.3 and later:
<b><a href="postconf.5.html#smtpd_sasl_authenticated_header">smtpd_sasl_authenticated_header</a> (no)</b>
Report the SASL authenticated user name in the
Report the SASL authenticated user name in the
<a href="smtpd.8.html"><b>smtpd</b>(8)</a> Received message header.
<b><a href="postconf.5.html#smtpd_sasl_path">smtpd_sasl_path</a> (smtpd)</b>
Implementation-specific information that the Post-
fix SMTP server passes through to the SASL plug-in
implementation that is selected with
Implementation-specific information that the Post-
fix SMTP server passes through to the SASL plug-in
implementation that is selected with
<b><a href="postconf.5.html#smtpd_sasl_type">smtpd_sasl_type</a></b>.
<b><a href="postconf.5.html#smtpd_sasl_type">smtpd_sasl_type</a> (cyrus)</b>
The SASL plug-in type that the Postfix SMTP server
The SASL plug-in type that the Postfix SMTP server
should use for authentication.
Available in Postfix version 2.5 and later:
<b><a href="postconf.5.html#cyrus_sasl_config_path">cyrus_sasl_config_path</a> (empty)</b>
Search path for Cyrus SASL application configura-
tion files, currently used only to locate the
Search path for Cyrus SASL application configura-
tion files, currently used only to locate the
$<a href="postconf.5.html#smtpd_sasl_path">smtpd_sasl_path</a>.conf file.
<b>STARTTLS SUPPORT CONTROLS</b>
Detailed information about STARTTLS configuration may be
Detailed information about STARTTLS configuration may be
found in the <a href="TLS_README.html">TLS_README</a> document.
<b><a href="postconf.5.html#smtpd_tls_security_level">smtpd_tls_security_level</a> (empty)</b>
The SMTP TLS security level for the Postfix SMTP
server; when a non-empty value is specified, this
The SMTP TLS security level for the Postfix SMTP
server; when a non-empty value is specified, this
overrides the obsolete parameters <a href="postconf.5.html#smtpd_use_tls">smtpd_use_tls</a> and
<a href="postconf.5.html#smtpd_enforce_tls">smtpd_enforce_tls</a>.
<b><a href="postconf.5.html#smtpd_sasl_tls_security_options">smtpd_sasl_tls_security_options</a> ($<a href="postconf.5.html#smtpd_sasl_security_options">smtpd_sasl_secu</a>-</b>
<b><a href="postconf.5.html#smtpd_sasl_security_options">rity_options</a>)</b>
The SASL authentication security options that the
Postfix SMTP server uses for TLS encrypted SMTP
The SASL authentication security options that the
Postfix SMTP server uses for TLS encrypted SMTP
sessions.
<b><a href="postconf.5.html#smtpd_starttls_timeout">smtpd_starttls_timeout</a> (see 'postconf -d' output)</b>
The time limit for Postfix SMTP server write and
read operations during TLS startup and shutdown
The time limit for Postfix SMTP server write and
read operations during TLS startup and shutdown
handshake procedures.
<b><a href="postconf.5.html#smtpd_tls_CAfile">smtpd_tls_CAfile</a> (empty)</b>
A file containing (PEM format) CA certificates of
root CAs trusted to sign either remote SMTP client
A file containing (PEM format) CA certificates of
root CAs trusted to sign either remote SMTP client
certificates or intermediate CA certificates.
<b><a href="postconf.5.html#smtpd_tls_CApath">smtpd_tls_CApath</a> (empty)</b>
A directory containing (PEM format) CA certificates
of root CAs trusted to sign either remote SMTP
client certificates or intermediate CA certifi-
of root CAs trusted to sign either remote SMTP
client certificates or intermediate CA certifi-
cates.
<b><a href="postconf.5.html#smtpd_tls_always_issue_session_ids">smtpd_tls_always_issue_session_ids</a> (yes)</b>
Force the Postfix SMTP server to issue a TLS ses-
sion id, even when TLS session caching is turned
Force the Postfix SMTP server to issue a TLS ses-
sion id, even when TLS session caching is turned
off (<a href="postconf.5.html#smtpd_tls_session_cache_database">smtpd_tls_session_cache_database</a> is empty).
<b><a href="postconf.5.html#smtpd_tls_ask_ccert">smtpd_tls_ask_ccert</a> (no)</b>
Ask a remote SMTP client for a client certificate.
Ask a remote SMTP client for a client certificate.
<b><a href="postconf.5.html#smtpd_tls_auth_only">smtpd_tls_auth_only</a> (no)</b>
When TLS encryption is optional in the Postfix SMTP
server, do not announce or accept SASL authentica-
server, do not announce or accept SASL authentica-
tion over unencrypted connections.
<b><a href="postconf.5.html#smtpd_tls_ccert_verifydepth">smtpd_tls_ccert_verifydepth</a> (9)</b>
The verification depth for remote SMTP client cer-
The verification depth for remote SMTP client cer-
tificates.
<b><a href="postconf.5.html#smtpd_tls_cert_file">smtpd_tls_cert_file</a> (empty)</b>
File with the Postfix SMTP server RSA certificate
File with the Postfix SMTP server RSA certificate
in PEM format.
<b><a href="postconf.5.html#smtpd_tls_exclude_ciphers">smtpd_tls_exclude_ciphers</a> (empty)</b>
@ -430,56 +440,56 @@ SMTPD(8) SMTPD(8)
SMTP server cipher list at all TLS security levels.
<b><a href="postconf.5.html#smtpd_tls_dcert_file">smtpd_tls_dcert_file</a> (empty)</b>
File with the Postfix SMTP server DSA certificate
File with the Postfix SMTP server DSA certificate
in PEM format.
<b><a href="postconf.5.html#smtpd_tls_dh1024_param_file">smtpd_tls_dh1024_param_file</a> (empty)</b>
File with DH parameters that the Postfix SMTP
server should use with EDH ciphers.
<b><a href="postconf.5.html#smtpd_tls_dh512_param_file">smtpd_tls_dh512_param_file</a> (empty)</b>
File with DH parameters that the Postfix SMTP
server should use with EDH ciphers.
<b><a href="postconf.5.html#smtpd_tls_dh512_param_file">smtpd_tls_dh512_param_file</a> (empty)</b>
File with DH parameters that the Postfix SMTP
server should use with EDH ciphers.
<b><a href="postconf.5.html#smtpd_tls_dkey_file">smtpd_tls_dkey_file</a> ($<a href="postconf.5.html#smtpd_tls_dcert_file">smtpd_tls_dcert_file</a>)</b>
File with the Postfix SMTP server DSA private key
File with the Postfix SMTP server DSA private key
in PEM format.
<b><a href="postconf.5.html#smtpd_tls_key_file">smtpd_tls_key_file</a> ($<a href="postconf.5.html#smtpd_tls_cert_file">smtpd_tls_cert_file</a>)</b>
File with the Postfix SMTP server RSA private key
File with the Postfix SMTP server RSA private key
in PEM format.
<b><a href="postconf.5.html#smtpd_tls_loglevel">smtpd_tls_loglevel</a> (0)</b>
Enable additional Postfix SMTP server logging of
Enable additional Postfix SMTP server logging of
TLS activity.
<b><a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a> (medium)</b>
The minimum TLS cipher grade that the Postfix SMTP
The minimum TLS cipher grade that the Postfix SMTP
server will use with mandatory TLS encryption.
<b><a href="postconf.5.html#smtpd_tls_mandatory_exclude_ciphers">smtpd_tls_mandatory_exclude_ciphers</a> (empty)</b>
Additional list of ciphers or cipher types to
exclude from the SMTP server cipher list at manda-
Additional list of ciphers or cipher types to
exclude from the SMTP server cipher list at manda-
tory TLS security levels.
<b><a href="postconf.5.html#smtpd_tls_mandatory_protocols">smtpd_tls_mandatory_protocols</a> (SSLv3, TLSv1)</b>
The SSL/TLS protocols accepted by the Postfix SMTP
The SSL/TLS protocols accepted by the Postfix SMTP
server with mandatory TLS encryption.
<b><a href="postconf.5.html#smtpd_tls_received_header">smtpd_tls_received_header</a> (no)</b>
Request that the Postfix SMTP server produces
Received: message headers that include information
about the protocol and cipher used, as well as the
client CommonName and client certificate issuer
about the protocol and cipher used, as well as the
client CommonName and client certificate issuer
CommonName.
<b><a href="postconf.5.html#smtpd_tls_req_ccert">smtpd_tls_req_ccert</a> (no)</b>
With mandatory TLS encryption, require a trusted
remote SMTP client certificate in order to allow
With mandatory TLS encryption, require a trusted
remote SMTP client certificate in order to allow
TLS connections to proceed.
<b><a href="postconf.5.html#smtpd_tls_session_cache_database">smtpd_tls_session_cache_database</a> (empty)</b>
Name of the file containing the optional Postfix
Name of the file containing the optional Postfix
SMTP server TLS session cache.
<b><a href="postconf.5.html#smtpd_tls_session_cache_timeout">smtpd_tls_session_cache_timeout</a> (3600s)</b>
@ -487,14 +497,14 @@ SMTPD(8) SMTPD(8)
sion cache information.
<b><a href="postconf.5.html#smtpd_tls_wrappermode">smtpd_tls_wrappermode</a> (no)</b>
Run the Postfix SMTP server in the non-standard
"wrapper" mode, instead of using the STARTTLS com-
Run the Postfix SMTP server in the non-standard
"wrapper" mode, instead of using the STARTTLS com-
mand.
<b><a href="postconf.5.html#tls_daemon_random_bytes">tls_daemon_random_bytes</a> (32)</b>
The number of pseudo-random bytes that an <a href="smtp.8.html"><b>smtp</b>(8)</a>
or <a href="smtpd.8.html"><b>smtpd</b>(8)</a> process requests from the <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a>
server in order to seed its internal pseudo random
The number of pseudo-random bytes that an <a href="smtp.8.html"><b>smtp</b>(8)</a>
or <a href="smtpd.8.html"><b>smtpd</b>(8)</a> process requests from the <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a>
server in order to seed its internal pseudo random
number generator (PRNG).
<b><a href="postconf.5.html#tls_high_cipherlist">tls_high_cipherlist</a></b>
@ -506,7 +516,7 @@ SMTPD(8) SMTPD(8)
ciphers.
<b><a href="postconf.5.html#tls_low_cipherlist">tls_low_cipherlist</a> (ALL:!EXPORT:+RC4:@STRENGTH)</b>
The OpenSSL cipherlist for "LOW" or higher grade
The OpenSSL cipherlist for "LOW" or higher grade
ciphers.
<b><a href="postconf.5.html#tls_export_cipherlist">tls_export_cipherlist</a> (ALL:+RC4:@STRENGTH)</b>
@ -514,26 +524,26 @@ SMTPD(8) SMTPD(8)
ciphers.
<b><a href="postconf.5.html#tls_null_cipherlist">tls_null_cipherlist</a> (eNULL:!aNULL)</b>
The OpenSSL cipherlist for "NULL" grade ciphers
The OpenSSL cipherlist for "NULL" grade ciphers
that provide authentication without encryption.
Available in Postfix version 2.5 and later:
<b><a href="postconf.5.html#smtpd_tls_fingerprint_digest">smtpd_tls_fingerprint_digest</a> (md5)</b>
The message digest algorithm used to construct
The message digest algorithm used to construct
client-certificate fingerprints for
<b><a href="postconf.5.html#check_ccert_access">check_ccert_access</a></b> and <b><a href="postconf.5.html#permit_tls_clientcerts">permit_tls_clientcerts</a></b>.
Available in Postfix version 2.6 and later:
<b><a href="postconf.5.html#smtpd_tls_protocols">smtpd_tls_protocols</a> (empty)</b>
List of TLS protocols that the Postfix SMTP server
will exclude or include with opportunistic TLS
List of TLS protocols that the Postfix SMTP server
will exclude or include with opportunistic TLS
encryption.
<b><a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a> (export)</b>
The minimum TLS cipher grade that the Postfix SMTP
server will use with opportunistic TLS encryption.
The minimum TLS cipher grade that the Postfix SMTP
server will use with opportunistic TLS encryption.
<b><a href="postconf.5.html#smtpd_tls_eccert_file">smtpd_tls_eccert_file</a> (empty)</b>
File with the Postfix SMTP server ECDSA certificate
@ -544,7 +554,7 @@ SMTPD(8) SMTPD(8)
in PEM format.
<b><a href="postconf.5.html#smtpd_tls_eecdh_grade">smtpd_tls_eecdh_grade</a> (see 'postconf -d' output)</b>
The Postfix SMTP server security grade for
The Postfix SMTP server security grade for
ephemeral elliptic-curve Diffie-Hellman (EECDH) key
exchange.
@ -564,22 +574,22 @@ SMTPD(8) SMTPD(8)
ence order.
<b><a href="postconf.5.html#tls_disable_workarounds">tls_disable_workarounds</a> (see 'postconf -d' output)</b>
List or bit-mask of OpenSSL bug work-arounds to
List or bit-mask of OpenSSL bug work-arounds to
disable.
<b>OBSOLETE STARTTLS CONTROLS</b>
The following configuration parameters exist for compati-
The following configuration parameters exist for compati-
bility with Postfix versions before 2.3. Support for these
will be removed in a future release.
<b><a href="postconf.5.html#smtpd_use_tls">smtpd_use_tls</a> (no)</b>
Opportunistic TLS: announce STARTTLS support to
SMTP clients, but do not require that clients use
Opportunistic TLS: announce STARTTLS support to
SMTP clients, but do not require that clients use
TLS encryption.
<b><a href="postconf.5.html#smtpd_enforce_tls">smtpd_enforce_tls</a> (no)</b>
Mandatory TLS: announce STARTTLS support to SMTP
clients, and require that clients use TLS encryp-
Mandatory TLS: announce STARTTLS support to SMTP
clients, and require that clients use TLS encryp-
tion.
<b><a href="postconf.5.html#smtpd_tls_cipherlist">smtpd_tls_cipherlist</a> (empty)</b>
@ -587,68 +597,68 @@ SMTPD(8) SMTPD(8)
server TLS cipher list.
<b>VERP SUPPORT CONTROLS</b>
With VERP style delivery, each recipient of a message
With VERP style delivery, each recipient of a message
receives a customized copy of the message with his/her own
recipient address encoded in the envelope sender address.
recipient address encoded in the envelope sender address.
The <a href="VERP_README.html">VERP_README</a> file describes configuration and operation
details of Postfix support for variable envelope return
details of Postfix support for variable envelope return
path addresses. VERP style delivery is requested with the
SMTP XVERP command or with the "sendmail -V" command-line
option and is available in Postfix version 1.1 and later.
SMTP XVERP command or with the "sendmail -V" command-line
option and is available in Postfix version 1.1 and later.
<b><a href="postconf.5.html#default_verp_delimiters">default_verp_delimiters</a> (+=)</b>
The two default VERP delimiter characters.
<b><a href="postconf.5.html#verp_delimiter_filter">verp_delimiter_filter</a> (-=+)</b>
The characters Postfix accepts as VERP delimiter
characters on the Postfix <a href="sendmail.1.html"><b>sendmail</b>(1)</a> command line
The characters Postfix accepts as VERP delimiter
characters on the Postfix <a href="sendmail.1.html"><b>sendmail</b>(1)</a> command line
and in SMTP commands.
Available in Postfix version 1.1 and 2.0:
<b><a href="postconf.5.html#authorized_verp_clients">authorized_verp_clients</a> ($<a href="postconf.5.html#mynetworks">mynetworks</a>)</b>
What SMTP clients are allowed to specify the XVERP
What SMTP clients are allowed to specify the XVERP
command.
Available in Postfix version 2.1 and later:
<b><a href="postconf.5.html#smtpd_authorized_verp_clients">smtpd_authorized_verp_clients</a> ($<a href="postconf.5.html#authorized_verp_clients">authorized_verp_clients</a>)</b>
What SMTP clients are allowed to specify the XVERP
What SMTP clients are allowed to specify the XVERP
command.
<b>TROUBLE SHOOTING CONTROLS</b>
The <a href="DEBUG_README.html">DEBUG_README</a> document describes how to debug parts of
the Postfix mail system. The methods vary from making the
software log a lot of detail, to running some daemon pro-
The <a href="DEBUG_README.html">DEBUG_README</a> document describes how to debug parts of
the Postfix mail system. The methods vary from making the
software log a lot of detail, to running some daemon pro-
cesses under control of a call tracer or debugger.
<b><a href="postconf.5.html#debug_peer_level">debug_peer_level</a> (2)</b>
The increment in verbose logging level when a
remote client or server matches a pattern in the
The increment in verbose logging level when a
remote client or server matches a pattern in the
<a href="postconf.5.html#debug_peer_list">debug_peer_list</a> parameter.
<b><a href="postconf.5.html#debug_peer_list">debug_peer_list</a> (empty)</b>
Optional list of remote client or server hostname
or network address patterns that cause the verbose
logging level to increase by the amount specified
Optional list of remote client or server hostname
or network address patterns that cause the verbose
logging level to increase by the amount specified
in $<a href="postconf.5.html#debug_peer_level">debug_peer_level</a>.
<b><a href="postconf.5.html#error_notice_recipient">error_notice_recipient</a> (postmaster)</b>
The recipient of postmaster notifications about
mail delivery problems that are caused by policy,
The recipient of postmaster notifications about
mail delivery problems that are caused by policy,
resource, software or protocol errors.
<b><a href="postconf.5.html#internal_mail_filter_classes">internal_mail_filter_classes</a> (empty)</b>
What categories of Postfix-generated mail are sub-
ject to before-queue content inspection by
What categories of Postfix-generated mail are sub-
ject to before-queue content inspection by
<a href="postconf.5.html#non_smtpd_milters">non_smtpd_milters</a>, <a href="postconf.5.html#header_checks">header_checks</a> and <a href="postconf.5.html#body_checks">body_checks</a>.
<b><a href="postconf.5.html#notify_classes">notify_classes</a> (resource, software)</b>
The list of error classes that are reported to the
The list of error classes that are reported to the
postmaster.
<b><a href="postconf.5.html#smtpd_reject_footer">smtpd_reject_footer</a> (empty)</b>
Optional information that is appended after each
Optional information that is appended after each
SMTP server 4XX or 5XX response.
<b><a href="postconf.5.html#soft_bounce">soft_bounce</a> (no)</b>
@ -658,22 +668,22 @@ SMTPD(8) SMTPD(8)
Available in Postfix version 2.1 and later:
<b><a href="postconf.5.html#smtpd_authorized_xclient_hosts">smtpd_authorized_xclient_hosts</a> (empty)</b>
What SMTP clients are allowed to use the XCLIENT
What SMTP clients are allowed to use the XCLIENT
feature.
<b>KNOWN VERSUS UNKNOWN RECIPIENT CONTROLS</b>
As of Postfix version 2.0, the SMTP server rejects mail
for unknown recipients. This prevents the mail queue from
clogging up with undeliverable MAILER-DAEMON messages.
Additional information on this topic is in the
As of Postfix version 2.0, the SMTP server rejects mail
for unknown recipients. This prevents the mail queue from
clogging up with undeliverable MAILER-DAEMON messages.
Additional information on this topic is in the
<a href="LOCAL_RECIPIENT_README.html">LOCAL_RECIPIENT_README</a> and <a href="ADDRESS_CLASS_README.html">ADDRESS_CLASS_README</a> documents.
<b><a href="postconf.5.html#show_user_unknown_table_name">show_user_unknown_table_name</a> (yes)</b>
Display the name of the recipient table in the
Display the name of the recipient table in the
"User unknown" responses.
<b><a href="postconf.5.html#canonical_maps">canonical_maps</a> (empty)</b>
Optional address mapping lookup tables for message
Optional address mapping lookup tables for message
headers and envelopes.
<b><a href="postconf.5.html#recipient_canonical_maps">recipient_canonical_maps</a> (empty)</b>
@ -684,7 +694,7 @@ SMTPD(8) SMTPD(8)
<b><a href="postconf.5.html#mydestination">mydestination</a> ($<a href="postconf.5.html#myhostname">myhostname</a>, localhost.$<a href="postconf.5.html#mydomain">mydomain</a>, local-</b>
<b>host)</b>
The list of domains that are delivered via the
The list of domains that are delivered via the
$<a href="postconf.5.html#local_transport">local_transport</a> mail delivery transport.
<b><a href="postconf.5.html#inet_interfaces">inet_interfaces</a> (all)</b>
@ -693,146 +703,146 @@ SMTPD(8) SMTPD(8)
<b><a href="postconf.5.html#proxy_interfaces">proxy_interfaces</a> (empty)</b>
The network interface addresses that this mail sys-
tem receives mail on by way of a proxy or network
tem receives mail on by way of a proxy or network
address translation unit.
<b><a href="postconf.5.html#inet_protocols">inet_protocols</a> (ipv4)</b>
The Internet protocols Postfix will attempt to use
The Internet protocols Postfix will attempt to use
when making or accepting connections.
<b><a href="postconf.5.html#local_recipient_maps">local_recipient_maps</a> (<a href="proxymap.8.html">proxy</a>:unix:passwd.byname</b>
<b>$<a href="postconf.5.html#alias_maps">alias_maps</a>)</b>
Lookup tables with all names or addresses of local
recipients: a recipient address is local when its
domain matches $<a href="postconf.5.html#mydestination">mydestination</a>, $<a href="postconf.5.html#inet_interfaces">inet_interfaces</a> or
Lookup tables with all names or addresses of local
recipients: a recipient address is local when its
domain matches $<a href="postconf.5.html#mydestination">mydestination</a>, $<a href="postconf.5.html#inet_interfaces">inet_interfaces</a> or
$<a href="postconf.5.html#proxy_interfaces">proxy_interfaces</a>.
<b><a href="postconf.5.html#unknown_local_recipient_reject_code">unknown_local_recipient_reject_code</a> (550)</b>
The numerical Postfix SMTP server response code
when a recipient address is local, and
$<a href="postconf.5.html#local_recipient_maps">local_recipient_maps</a> specifies a list of lookup
The numerical Postfix SMTP server response code
when a recipient address is local, and
$<a href="postconf.5.html#local_recipient_maps">local_recipient_maps</a> specifies a list of lookup
tables that does not match the recipient.
Parameters concerning known/unknown recipients of relay
Parameters concerning known/unknown recipients of relay
destinations:
<b><a href="postconf.5.html#relay_domains">relay_domains</a> ($<a href="postconf.5.html#mydestination">mydestination</a>)</b>
What destination domains (and subdomains thereof)
What destination domains (and subdomains thereof)
this system will relay mail to.
<b><a href="postconf.5.html#relay_recipient_maps">relay_recipient_maps</a> (empty)</b>
Optional lookup tables with all valid addresses in
Optional lookup tables with all valid addresses in
the domains that match $<a href="postconf.5.html#relay_domains">relay_domains</a>.
<b><a href="postconf.5.html#unknown_relay_recipient_reject_code">unknown_relay_recipient_reject_code</a> (550)</b>
The numerical Postfix SMTP server reply code when a
recipient address matches $<a href="postconf.5.html#relay_domains">relay_domains</a>, and
<a href="postconf.5.html#relay_recipient_maps">relay_recipient_maps</a> specifies a list of lookup
recipient address matches $<a href="postconf.5.html#relay_domains">relay_domains</a>, and
<a href="postconf.5.html#relay_recipient_maps">relay_recipient_maps</a> specifies a list of lookup
tables that does not match the recipient address.
Parameters concerning known/unknown recipients in virtual
Parameters concerning known/unknown recipients in virtual
alias domains:
<b><a href="postconf.5.html#virtual_alias_domains">virtual_alias_domains</a> ($<a href="postconf.5.html#virtual_alias_maps">virtual_alias_maps</a>)</b>
Postfix is final destination for the specified list
of virtual alias domains, that is, domains for
which all addresses are aliased to addresses in
of virtual alias domains, that is, domains for
which all addresses are aliased to addresses in
other local or remote domains.
<b><a href="postconf.5.html#virtual_alias_maps">virtual_alias_maps</a> ($<a href="postconf.5.html#virtual_maps">virtual_maps</a>)</b>
Optional lookup tables that alias specific mail
addresses or domains to other local or remote
Optional lookup tables that alias specific mail
addresses or domains to other local or remote
address.
<b><a href="postconf.5.html#unknown_virtual_alias_reject_code">unknown_virtual_alias_reject_code</a> (550)</b>
The SMTP server reply code when a recipient address
matches $<a href="postconf.5.html#virtual_alias_domains">virtual_alias_domains</a>, and $<a href="postconf.5.html#virtual_alias_maps">vir</a>-
<a href="postconf.5.html#virtual_alias_maps">tual_alias_maps</a> specifies a list of lookup tables
matches $<a href="postconf.5.html#virtual_alias_domains">virtual_alias_domains</a>, and $<a href="postconf.5.html#virtual_alias_maps">vir</a>-
<a href="postconf.5.html#virtual_alias_maps">tual_alias_maps</a> specifies a list of lookup tables
that does not match the recipient address.
Parameters concerning known/unknown recipients in virtual
Parameters concerning known/unknown recipients in virtual
mailbox domains:
<b><a href="postconf.5.html#virtual_mailbox_domains">virtual_mailbox_domains</a> ($<a href="postconf.5.html#virtual_mailbox_maps">virtual_mailbox_maps</a>)</b>
Postfix is final destination for the specified list
of domains; mail is delivered via the $<a href="postconf.5.html#virtual_transport">vir</a>-
of domains; mail is delivered via the $<a href="postconf.5.html#virtual_transport">vir</a>-
<a href="postconf.5.html#virtual_transport">tual_transport</a> mail delivery transport.
<b><a href="postconf.5.html#virtual_mailbox_maps">virtual_mailbox_maps</a> (empty)</b>
Optional lookup tables with all valid addresses in
Optional lookup tables with all valid addresses in
the domains that match $<a href="postconf.5.html#virtual_mailbox_domains">virtual_mailbox_domains</a>.
<b><a href="postconf.5.html#unknown_virtual_mailbox_reject_code">unknown_virtual_mailbox_reject_code</a> (550)</b>
The SMTP server reply code when a recipient address
matches $<a href="postconf.5.html#virtual_mailbox_domains">virtual_mailbox_domains</a>, and $<a href="postconf.5.html#virtual_mailbox_maps">vir</a>-
matches $<a href="postconf.5.html#virtual_mailbox_domains">virtual_mailbox_domains</a>, and $<a href="postconf.5.html#virtual_mailbox_maps">vir</a>-
<a href="postconf.5.html#virtual_mailbox_maps">tual_mailbox_maps</a> specifies a list of lookup tables
that does not match the recipient address.
<b>RESOURCE AND RATE CONTROLS</b>
The following parameters limit resource usage by the SMTP
The following parameters limit resource usage by the SMTP
server and/or control client request rates.
<b><a href="postconf.5.html#line_length_limit">line_length_limit</a> (2048)</b>
Upon input, long lines are chopped up into pieces
of at most this length; upon delivery, long lines
Upon input, long lines are chopped up into pieces
of at most this length; upon delivery, long lines
are reconstructed.
<b><a href="postconf.5.html#queue_minfree">queue_minfree</a> (0)</b>
The minimal amount of free space in bytes in the
The minimal amount of free space in bytes in the
queue file system that is needed to receive mail.
<b><a href="postconf.5.html#message_size_limit">message_size_limit</a> (10240000)</b>
The maximal size in bytes of a message, including
The maximal size in bytes of a message, including
envelope information.
<b><a href="postconf.5.html#smtpd_recipient_limit">smtpd_recipient_limit</a> (1000)</b>
The maximal number of recipients that the Postfix
The maximal number of recipients that the Postfix
SMTP server accepts per message delivery request.
<b><a href="postconf.5.html#smtpd_timeout">smtpd_timeout</a> (normal: 300s, overload: 10s)</b>
The time limit for sending a Postfix SMTP server
response and for receiving a remote SMTP client
The time limit for sending a Postfix SMTP server
response and for receiving a remote SMTP client
request.
<b><a href="postconf.5.html#smtpd_history_flush_threshold">smtpd_history_flush_threshold</a> (100)</b>
The maximal number of lines in the Postfix SMTP
server command history before it is flushed upon
The maximal number of lines in the Postfix SMTP
server command history before it is flushed upon
receipt of EHLO, RSET, or end of DATA.
Available in Postfix version 2.3 and later:
<b><a href="postconf.5.html#smtpd_peername_lookup">smtpd_peername_lookup</a> (yes)</b>
Attempt to look up the remote SMTP client hostname,
and verify that the name matches the client IP
and verify that the name matches the client IP
address.
The per SMTP client connection count and request rate lim-
its are implemented in co-operation with the <a href="anvil.8.html"><b>anvil</b>(8)</a> ser-
vice, and are available in Postfix version 2.2 and later.
vice, and are available in Postfix version 2.2 and later.
<b><a href="postconf.5.html#smtpd_client_connection_count_limit">smtpd_client_connection_count_limit</a> (50)</b>
How many simultaneous connections any client is
How many simultaneous connections any client is
allowed to make to this service.
<b><a href="postconf.5.html#smtpd_client_connection_rate_limit">smtpd_client_connection_rate_limit</a> (0)</b>
The maximal number of connection attempts any
client is allowed to make to this service per time
client is allowed to make to this service per time
unit.
<b><a href="postconf.5.html#smtpd_client_message_rate_limit">smtpd_client_message_rate_limit</a> (0)</b>
The maximal number of message delivery requests
that any client is allowed to make to this service
The maximal number of message delivery requests
that any client is allowed to make to this service
per time unit, regardless of whether or not Postfix
actually accepts those messages.
<b><a href="postconf.5.html#smtpd_client_recipient_rate_limit">smtpd_client_recipient_rate_limit</a> (0)</b>
The maximal number of recipient addresses that any
client is allowed to send to this service per time
The maximal number of recipient addresses that any
client is allowed to send to this service per time
unit, regardless of whether or not Postfix actually
accepts those recipients.
<b><a href="postconf.5.html#smtpd_client_event_limit_exceptions">smtpd_client_event_limit_exceptions</a> ($<a href="postconf.5.html#mynetworks">mynetworks</a>)</b>
Clients that are excluded from
Clients that are excluded from
smtpd_client_*_count/rate_limit restrictions.
Available in Postfix version 2.3 and later:
@ -842,6 +852,16 @@ SMTPD(8) SMTPD(8)
sions that a remote SMTP client is allowed to nego-
tiate with this service per time unit.
Available in Postfix version 2.9 and later:
<b><a href="postconf.5.html#smtpd_per_record_deadline">smtpd_per_record_deadline</a> (normal: no, overload: yes)</b>
Change the behavior of the <a href="postconf.5.html#smtpd_timeout">smtpd_timeout</a> time
limit, from a time limit per read or write system
call, to a time limit to read or write a complete
record (an SMTP command line, SMTP response line,
SMTP message content line, or TLS protocol mes-
sage).
<b>TARPIT CONTROLS</b>
When a remote SMTP client makes errors, the Postfix SMTP
server can insert delays before responding. This can help

39
postfix/man/man5/postconf.5
View File

@ -2236,6 +2236,11 @@ The LMTP-specific version of the smtp_nested_header_checks
configuration parameter. See there for details.
.PP
This feature is available in Postfix 2.5 and later.
.SH lmtp_per_record_deadline (default: no)
The LMTP-specific version of the smtp_per_record_deadline
configuration parameter. See there for details.
.PP
This feature is available in Postfix 2.8 and later.
.SH lmtp_pix_workaround_delay_time (default: 10s)
The LMTP-specific version of the smtp_pix_workaround_delay_time
configuration parameter. See there for details.
@ -5499,6 +5504,23 @@ This feature is available in Postfix 2.5 and later.
.SH smtp_never_send_ehlo (default: no)
Never send EHLO at the start of an SMTP session. See also the
smtp_always_send_ehlo parameter.
.SH smtp_per_record_deadline (default: no)
Change the behavior of the smtp_*_timeout time limits, from a
time limit per read or write system call, to a time limit to send
or receive a complete record (an SMTP command line, SMTP response
line, SMTP message content line, or TLS protocol message). This
limits the impact from hostile peers that trickle data one byte at
a time.
.PP
Note: when per-record deadlines are enabled, a short timeout
may cause problems with TLS over very slow network connections.
The reasons are that a TLS protocol message can be up to 16 kbytes
long (with TLSv1), and that an entire TLS protocol message must be
sent or received within the per-record deadline.
.PP
This feature is available in Postfix 2.9 and later. With older
Postfix releases, the behavior is as if this parameter is set to
"no".
.SH smtp_pix_workaround_delay_time (default: 10s)
How long the Postfix SMTP client pauses before sending
".<CR><LF>" in order to work around the PIX firewall
@ -7912,6 +7934,23 @@ lookup is disabled. Turning off name lookup reduces delays due to
DNS lookup and increases the maximal inbound delivery rate.
.PP
This feature is available in Postfix 2.3 and later.
.SH smtpd_per_record_deadline (default: normal: no, overload: yes)
Change the behavior of the smtpd_timeout time limit, from a
time limit per read or write system call, to a time limit to send
or receive a complete record (an SMTP command line, SMTP response
line, SMTP message content line, or TLS protocol message). This
limits the impact from hostile peers that trickle data one byte at
a time.
.PP
Note: when per-record deadlines are enabled, a short timeout
may cause problems with TLS over very slow network connections.
The reasons are that a TLS protocol message can be up to 16 kbytes
long (with TLSv1), and that an entire TLS protocol message must be
sent or received within the per-record deadline.
.PP
This feature is available in Postfix 2.9 and later. With older
Postfix releases, the behavior is as if this parameter is set to
"no".
.SH smtpd_policy_service_max_idle (default: 300s)
The time after which an idle SMTPD policy service connection is
closed.

3
postfix/man/man8/postscreen.8
View File

@ -82,7 +82,8 @@ XFORWARD.
Support for AUTH may be added in the future.
In the mean time, if you need to make these services available
on port 25, then do not enable the optional "after 220
server greeting" tests.
server greeting" tests, and do not use DNSBLs that reject
traffic from dial-up and residential networks.
The optional "after 220 server greeting" tests involve
\fBpostscreen\fR(8)'s built-in SMTP protocol engine. When

14
postfix/man/man8/smtp.8
View File

@ -256,6 +256,13 @@ An optional workaround for routers that break TCP window scaling.
Available in Postfix version 2.8 and later:
.IP "\fBsmtp_dns_resolver_options (empty)\fR"
DNS Resolver options for the Postfix SMTP client.
.PP
Available in Postfix version 2.9 and later:
.IP "\fBsmtp_per_record_deadline (no)\fR"
Change the behavior of the smtp_*_timeout time limits, from a
time limit per read or write system call, to a time limit to read
or write a complete record (an SMTP command line, SMTP response
line, SMTP message content line, or TLS protocol message).
.SH "MIME PROCESSING CONTROLS"
.na
.nf
@ -547,6 +554,13 @@ Available in Postfix version 2.3 and later:
.IP "\fBconnection_cache_protocol_timeout (5s)\fR"
Time limit for connection cache connect, send or receive
operations.
.PP
Available in Postfix version 2.9 and later:
.IP "\fBsmtp_per_record_deadline (no)\fR"
Change the behavior of the smtp_*_timeout time limits, from a
time limit per read or write system call, to a time limit to read
or write a complete record (an SMTP command line, SMTP response
line, SMTP message content line, or TLS protocol message).
.SH "TROUBLE SHOOTING CONTROLS"
.na
.nf

14
postfix/man/man8/smtpd.8
View File

@ -143,6 +143,13 @@ An optional workaround for routers that break TCP window scaling.
Available in Postfix version 2.7 and later:
.IP "\fBsmtpd_command_filter (empty)\fR"
A mechanism to transform commands from remote SMTP clients.
.PP
Available in Postfix version 2.9 and later:
.IP "\fBsmtpd_per_record_deadline (normal: no, overload: yes)\fR"
Change the behavior of the smtpd_timeout time limit, from a
time limit per read or write system call, to a time limit to read
or write a complete record (an SMTP command line, SMTP response
line, SMTP message content line, or TLS protocol message).
.SH "ADDRESS REWRITING CONTROLS"
.na
.nf
@ -673,6 +680,13 @@ Available in Postfix version 2.3 and later:
The maximal number of new (i.e., uncached) TLS sessions that a
remote SMTP client is allowed to negotiate with this service per
time unit.
.PP
Available in Postfix version 2.9 and later:
.IP "\fBsmtpd_per_record_deadline (normal: no, overload: yes)\fR"
Change the behavior of the smtpd_timeout time limit, from a
time limit per read or write system call, to a time limit to read
or write a complete record (an SMTP command line, SMTP response
line, SMTP message content line, or TLS protocol message).
.SH "TARPIT CONTROLS"
.na
.nf

2
postfix/mantools/postlink
View File

@ -631,6 +631,7 @@ while (<>) {
s;\bsmtp_body_checks\b;<a href="postconf.5.html#smtp_body_checks">$&</a>;g;
s;\bsmtp_reply_filter\b;<a href="postconf.5.html#smtp_reply_filter">$&</a>;g;
s;\bsmtp_address_preference\b;<a href="postconf.5.html#smtp_address_preference">$&</a>;g;
s;\bsmtp_per_record_deadline\b;<a href="postconf.5.html#smtp_per_record_deadline">$&</a>;g;
s;\bsmtpd_enforce_tls\b;<a href="postconf.5.html#smtpd_enforce_tls">$&</a>;g;
s;\bsmtpd_sasl_tls_security_options\b;<a href="postconf.5.html#smtpd_sasl_tls_security_options">$&</a>;g;
s;\bsmtpd_sasl_type\b;<a href="postconf.5.html#smtpd_sasl_type">$&</a>;g;
@ -667,6 +668,7 @@ while (<>) {
s;\bsmtpd_tls_wrappermode\b;<a href="postconf.5.html#smtpd_tls_wrappermode">$&</a>;g;
s;\bsmtpd_use_tls\b;<a href="postconf.5.html#smtpd_use_tls">$&</a>;g;
s;\bsmtpd_reject_footer\b;<a href="postconf.5.html#smtpd_reject_footer">$&</a>;g;
s;\bsmtpd_per_record_deadline\b;<a href="postconf.5.html#smtpd_per_record_deadline">$&</a>;g;
s;\btls_daemon_random_bytes\b;<a href="postconf.5.html#tls_daemon_random_bytes">$&</a>;g;
s;\btls_daemon_random_source\b;<a href="postconf.5.html#tls_daemon_random_source">$&</a>;g;
s;\btls_ran[-</Bb>]*\n* *[<Bb>]*dom_bytes\b;<a href="postconf.5.html#tls_random_bytes">$&</a>;g;

14
postfix/proto/MILTER_README.html
View File

@ -28,11 +28,13 @@ SMTP commands (HELO, MAIL FROM, etc.) as well as mail content
<p> The reason for adding Milter support to Postfix is that there
exists a large collection of applications, not only to block unwanted
mail, but also to verify authenticity (examples: <a
href="http://www.opendkim.org/">OpenDKIM</a>, <a
href="http://sourceforge.net/projects/dkim-milter/">DomainKeys
Identified Mail (DKIM)</a>, <a
href="http://sourceforge.net/projects/sid-milter/">SenderID+SPF</a> and
<a href="http://sourceforge.net/projects/dk-milter/">DomainKeys</a>)
or to digitally sign mail (examples: <a
href="http://www.opendkim.org/">OpenDKIM</a>, <a
href="http://sourceforge.net/projects/dkim-milter/">DomainKeys
Identified Mail (DKIM)</a>, <a
href="http://sourceforge.net/projects/dk-milter/">DomainKeys</a>).
@ -212,10 +214,22 @@ other systems, libmilter may be provided by a package (called
"sendmail-devel" on some Linux systems). </p>
<p> Once libmilter is installed, applications such as <a
href="http://www.opendkim.org/">OpenDKIM</a>, <a
href="http://sourceforge.net/projects/dkim-milter/">dkim-milter</a> and
<a href="http://sourceforge.net/projects/sid-milter/">sid-milter</a>
build out of the box without requiring any tinkering:</p>
<blockquote>
<pre>
$ <b>gzcat opendkim-<i>x.y.z</i>.tar.gz | tar xf -</b>
$ <b>cd opendkim-<i>x.y.z</i></b>
$ <b>./configure ...<i>options</i>...</b>
$ <b>make</b>
[...<i>lots of output omitted</i>...]
$ <b>make install</b>
</pre>
</blockquote>
<blockquote>
<pre>
$ <b>gzcat dkim-milter-<i>x.y.z</i>.tar.gz | tar xf -</b>

11
postfix/proto/POSTSCREEN_README.html
View File

@ -432,13 +432,14 @@ logging more informative. </p>
as: </p>
<pre>
<b>COMMAND PIPELINING after</b> <i>time</i> <b>from</b> <i>[address]:port</i>
<b>COMMAND PIPELINING from</b> <i>[address]:port</i> <b>after</b> <i>command</i>: <i>text</i>
</pre>
<p> Translation: the SMTP client at <i>[address]:port</i> sent multiple
SMTP commands, instead of sending one command and then waiting for
the server to reply. This happened <i>time</i> seconds after the
"220 " server greeting was sent. </p>
<p> Translation: the SMTP client at <i>[address]:port</i> sent
multiple SMTP commands, instead of sending one command and then
waiting for the server to reply. This happened after the client
sent <i>command</i>. The <i>text</i> shows part of the input that
was sent too early; it is not logged with Postfix 2.8. </p>
<p> The postscreen_pipelining_action parameter specifies the action
that is taken next. See "<a href="#fail_after_220">When tests fail

44
postfix/proto/postconf.proto
View File

@ -14011,3 +14011,47 @@ service performs plaintext &lt;=&gt; TLS ciphertext conversion. <p>
<p> This feature is available in Postfix 2.8 and later. </p>
%PARAM smtpd_per_record_deadline normal: no, overload: yes
<p> Change the behavior of the smtpd_timeout time limit, from a
time limit per read or write system call, to a time limit to send
or receive a complete record (an SMTP command line, SMTP response
line, SMTP message content line, or TLS protocol message). This
limits the impact from hostile peers that trickle data one byte at
a time. </p>
<p> Note: when per-record deadlines are enabled, a short timeout
may cause problems with TLS over very slow network connections.
The reasons are that a TLS protocol message can be up to 16 kbytes
long (with TLSv1), and that an entire TLS protocol message must be
sent or received within the per-record deadline. </p>
<p> This feature is available in Postfix 2.9 and later. With older
Postfix releases, the behavior is as if this parameter is set to
"no". </p>
%PARAM smtp_per_record_deadline no
<p> Change the behavior of the smtp_*_timeout time limits, from a
time limit per read or write system call, to a time limit to send
or receive a complete record (an SMTP command line, SMTP response
line, SMTP message content line, or TLS protocol message). This
limits the impact from hostile peers that trickle data one byte at
a time. </p>
<p> Note: when per-record deadlines are enabled, a short timeout
may cause problems with TLS over very slow network connections.
The reasons are that a TLS protocol message can be up to 16 kbytes
long (with TLSv1), and that an entire TLS protocol message must be
sent or received within the per-record deadline. </p>
<p> This feature is available in Postfix 2.9 and later. With older
Postfix releases, the behavior is as if this parameter is set to
"no". </p>
%PARAM lmtp_per_record_deadline no
<p> The LMTP-specific version of the smtp_per_record_deadline
configuration parameter. See there for details. </p>
<p> This feature is available in Postfix 2.8 and later. </p>

13
postfix/src/global/mail_params.h
View File

@ -3583,6 +3583,19 @@ extern bool var_tlsp_tls_set_sessid;
#define DEF_SMTPD_REJ_FOOTER ""
extern char *var_smtpd_rej_footer;
/*
* Per-record time limit support.
*/
#define VAR_SMTPD_REC_DEADLINE "smtpd_per_record_deadline"
#define DEF_SMTPD_REC_DEADLINE "${stress?yes}${stress:no}"
extern bool var_smtpd_rec_deadline;
#define VAR_SMTP_REC_DEADLINE "smtp_per_record_deadline"
#define DEF_SMTP_REC_DEADLINE 0
#define VAR_LMTP_REC_DEADLINE "lmtp_per_record_deadline"
#define DEF_LMTP_REC_DEADLINE 0
extern bool var_smtp_rec_deadline;
/* LICENSE
/* .ad
/* .fi

2
postfix/src/global/mail_version.h
View File

@ -20,7 +20,7 @@
* Patches change both the patchlevel and the release date. Snapshots have no
* patchlevel; they change the release date only.
*/
#define MAIL_RELEASE_DATE "20110207"
#define MAIL_RELEASE_DATE "20110212"
#define MAIL_VERSION_NUMBER "2.9"
#ifdef SNAPSHOT

37
postfix/src/global/smtp_stream.c
View File

@ -6,9 +6,10 @@
/* SYNOPSIS
/* #include <smtp_stream.h>
/*
/* void smtp_timeout_setup(stream, timeout)
/* void smtp_stream_setup(stream, timeout, enable_deadline)
/* VSTREAM *stream;
/* int timeout;
/* int enable_deadline;
/*
/* void smtp_printf(stream, format, ...)
/* VSTREAM *stream;
@ -44,16 +45,24 @@
/* VSTREAM *stream;
/* char *format;
/* va_list ap;
/* LEGACY API
/* void smtp_timeout_setup(stream, timeout)
/* VSTREAM *stream;
/* int timeout;
/* int enable_deadline;
/* DESCRIPTION
/* This module reads and writes text records delimited by CR LF,
/* with error detection: timeouts or unexpected end-of-file.
/* A trailing CR LF is added upon writing and removed upon reading.
/*
/* smtp_timeout_setup() arranges for a time limit on the smtp read
/* smtp_stream_setup() prepares the specified stream for SMTP read
/* and write operations described below.
/* This routine alters the behavior of streams as follows:
/* .IP \(bu
/* The read/write total time limit is set to the specified value.
/* When enable_deadline is non-zero, the stream is configured
/* to enforce a total time limit for each smtp_stream read/write
/* operation. Otherwise, the stream is configured to enforce
/* a time limit for each individual read/write system call.
/* .IP \f(bu
/* The stream is configured to use double buffering.
/* .IP \f(bu
@ -90,6 +99,9 @@
/* The stream is not flushed.
/*
/* smtp_vprintf() is the machine underneath smtp_printf().
/*
/* smtp_timeout_setup() is a backwards-compatibility interface
/* for programs that don't require per-record deadline support.
/* DIAGNOSTICS
/* .fi
/* .ad
@ -102,7 +114,7 @@
/* .IP SMTP_ERR_EOF
/* An I/O error happened, or the peer has disconnected unexpectedly.
/* .IP SMTP_ERR_TIME
/* The time limit specified to smtp_timeout_setup() was exceeded.
/* The time limit specified to smtp_stream_setup() was exceeded.
/* .PP
/* Additional error codes that may be used by applications:
/* .IP SMTP_ERR_QUIET
@ -166,9 +178,8 @@ static void smtp_timeout_reset(VSTREAM *stream)
* in the buffer. Such system calls would really hurt when receiving or
* sending body content one line at a time.
*/
vstream_control(stream,
VSTREAM_CTL_TIME_LIMIT, stream->timeout,
VSTREAM_CTL_END);
if (vstream_fstat(stream, VSTREAM_FLAG_DEADLINE))
vstream_control(stream, VSTREAM_CTL_START_DEADLINE, VSTREAM_CTL_END);
}
/* smtp_longjmp - raise an exception */
@ -190,13 +201,21 @@ static NORETURN smtp_longjmp(VSTREAM *stream, int err, const char *context)
vstream_longjmp(stream, err);
}
/* smtp_timeout_setup - configure timeout trap */
/* smtp_stream_setup - configure timeout trap */
void smtp_timeout_setup(VSTREAM *stream, int maxtime)
void smtp_stream_setup(VSTREAM *stream, int maxtime, int enable_deadline)
{
const char *myname = "smtp_stream_setup";
if (msg_verbose)
msg_info("%s: maxtime=%d enable_deadline=%d",
myname, maxtime, enable_deadline);
vstream_control(stream,
VSTREAM_CTL_DOUBLE,
VSTREAM_CTL_TIMEOUT, maxtime,
enable_deadline ? VSTREAM_CTL_START_DEADLINE
: VSTREAM_CTL_STOP_DEADLINE,
VSTREAM_CTL_EXCEPT,
VSTREAM_CTL_END);
}

5
postfix/src/global/smtp_stream.h
View File

@ -32,7 +32,7 @@
#define SMTP_ERR_QUIET 3 /* silent cleanup (application) */
#define SMTP_ERR_NONE 4 /* non-error case */
extern void smtp_timeout_setup(VSTREAM *, int);
extern void smtp_stream_setup(VSTREAM *, int, int);
extern void PRINTFLIKE(2, 3) smtp_printf(VSTREAM *, const char *,...);
extern void smtp_flush(VSTREAM *);
extern int smtp_fgetc(VSTREAM *);
@ -43,6 +43,9 @@ extern void smtp_fputc(int, VSTREAM *);
extern void smtp_vprintf(VSTREAM *, const char *, va_list);
#define smtp_timeout_setup(stream, timeout) \
smtp_stream_setup((stream), (timeout), 0)
#define SMTP_GET_FLAG_NONE 0
#define SMTP_GET_FLAG_SKIP (1<<0) /* skip over excess input */

3
postfix/src/postscreen/postscreen.c
View File

@ -68,7 +68,8 @@
/* Support for AUTH may be added in the future.
/* In the mean time, if you need to make these services available
/* on port 25, then do not enable the optional "after 220
/* server greeting" tests.
/* server greeting" tests, and do not use DNSBLs that reject
/* traffic from dial-up and residential networks.
/*
/* The optional "after 220 server greeting" tests involve
/* \fBpostscreen\fR(8)'s built-in SMTP protocol engine. When

4
postfix/src/postscreen/postscreen_tests.c
View File

@ -175,8 +175,8 @@ void psc_parse_tests(PSC_STATE *state,
/*
* Parse the cache entry, and allow for older postscreen versions that
* implemented fewer tests. We pretend that these tests were disabled
* when the cache entry was written.
* implemented fewer tests. We pretend that the newer tests were disabled
* at the time that the cache entry was written.
*
* Flag the cache entry as "new" when the cache entry has fields for all
* enabled tests, but the remote SMTP client has not yet passed all those

1
postfix/src/smtp/lmtp_params.c
View File

@ -108,5 +108,6 @@
VAR_LMTP_CNAME_OVERR, DEF_LMTP_CNAME_OVERR, &var_smtp_cname_overr,
VAR_LMTP_SASL_AUTH_SOFT_BOUNCE, DEF_LMTP_SASL_AUTH_SOFT_BOUNCE, &var_smtp_sasl_auth_soft_bounce,
VAR_LMTP_ASSUME_FINAL, DEF_LMTP_ASSUME_FINAL, &var_lmtp_assume_final,
VAR_LMTP_REC_DEADLINE, DEF_LMTP_REC_DEADLINE, &var_smtp_rec_deadline,
0,
};

15
postfix/src/smtp/smtp.c
View File

@ -234,6 +234,13 @@
/* Available in Postfix version 2.8 and later:
/* .IP "\fBsmtp_dns_resolver_options (empty)\fR"
/* DNS Resolver options for the Postfix SMTP client.
/* .PP
/* Available in Postfix version 2.9 and later:
/* .IP "\fBsmtp_per_record_deadline (no)\fR"
/* Change the behavior of the smtp_*_timeout time limits, from a
/* time limit per read or write system call, to a time limit to read
/* or write a complete record (an SMTP command line, SMTP response
/* line, SMTP message content line, or TLS protocol message).
/* MIME PROCESSING CONTROLS
/* .ad
/* .fi
@ -513,6 +520,13 @@
/* .IP "\fBconnection_cache_protocol_timeout (5s)\fR"
/* Time limit for connection cache connect, send or receive
/* operations.
/* .PP
/* Available in Postfix version 2.9 and later:
/* .IP "\fBsmtp_per_record_deadline (no)\fR"
/* Change the behavior of the smtp_*_timeout time limits, from a
/* time limit per read or write system call, to a time limit to read
/* or write a complete record (an SMTP command line, SMTP response
/* line, SMTP message content line, or TLS protocol message).
/* TROUBLE SHOOTING CONTROLS
/* .ad
/* .fi
@ -815,6 +829,7 @@ char *var_smtp_body_chks;
char *var_smtp_resp_filter;
bool var_lmtp_assume_final;
char *var_smtp_dns_res_opt;
bool var_smtp_rec_deadline;
/* Special handling of 535 AUTH errors. */
char *var_smtp_sasl_auth_cache_name;

1
postfix/src/smtp/smtp_params.c
View File

@ -112,5 +112,6 @@
VAR_SMTP_CNAME_OVERR, DEF_SMTP_CNAME_OVERR, &var_smtp_cname_overr,
VAR_SMTP_SASL_AUTH_SOFT_BOUNCE, DEF_SMTP_SASL_AUTH_SOFT_BOUNCE, &var_smtp_sasl_auth_soft_bounce,
VAR_LMTP_ASSUME_FINAL, DEF_LMTP_ASSUME_FINAL, &var_lmtp_assume_final,
VAR_SMTP_REC_DEADLINE, DEF_SMTP_REC_DEADLINE, &var_smtp_rec_deadline,
0,
};

18
postfix/src/smtp/smtp_proto.c
View File

@ -295,7 +295,8 @@ int smtp_helo(SMTP_STATE *state)
/*
* Prepare for disaster.
*/
smtp_timeout_setup(state->session->stream, var_smtp_helo_tmout);
smtp_stream_setup(state->session->stream, var_smtp_helo_tmout,
var_smtp_rec_deadline);
if ((except = vstream_setjmp(state->session->stream)) != 0)
return (smtp_stream_except(state, except, where));
@ -642,7 +643,8 @@ int smtp_helo(SMTP_STATE *state)
/*
* Prepare for disaster.
*/
smtp_timeout_setup(state->session->stream, var_smtp_starttls_tmout);
smtp_stream_setup(state->session->stream, var_smtp_starttls_tmout,
var_smtp_rec_deadline);
if ((except = vstream_setjmp(state->session->stream)) != 0)
return (smtp_stream_except(state, except,
"receiving the STARTTLS response"));
@ -1216,8 +1218,8 @@ static int smtp_loop(SMTP_STATE *state, NOCLOBBER int send_state,
|| send_state > SMTP_STATE_QUIT)
msg_panic("%s: bad sender state %d (receiver state %d)",
myname, send_state, recv_state);
smtp_timeout_setup(session->stream,
*xfer_timeouts[send_state]);
smtp_stream_setup(session->stream, *xfer_timeouts[send_state],
var_smtp_rec_deadline);
if ((except = vstream_setjmp(session->stream)) != 0) {
msg_warn("smtp_proto: spurious flush before read in send state %d",
send_state);
@ -1570,8 +1572,8 @@ static int smtp_loop(SMTP_STATE *state, NOCLOBBER int send_state,
*/
#define LOST_CONNECTION_INSIDE_DATA (except == SMTP_ERR_EOF)
smtp_timeout_setup(session->stream,
*xfer_timeouts[recv_state]);
smtp_stream_setup(session->stream, *xfer_timeouts[recv_state],
var_smtp_rec_deadline);
if (LOST_CONNECTION_INSIDE_DATA) {
if (vstream_setjmp(session->stream) != 0)
RETURN(smtp_stream_except(state, SMTP_ERR_EOF,
@ -1879,8 +1881,8 @@ static int smtp_loop(SMTP_STATE *state, NOCLOBBER int send_state,
*/
if (send_state == SMTP_STATE_DOT && nrcpt > 0) {
smtp_timeout_setup(session->stream,
var_smtp_data1_tmout);
smtp_stream_setup(session->stream, var_smtp_data1_tmout,
var_smtp_rec_deadline);
if ((except = vstream_setjmp(session->stream)) == 0) {

22
postfix/src/smtpd/smtpd.c
View File

@ -127,6 +127,13 @@
/* Available in Postfix version 2.7 and later:
/* .IP "\fBsmtpd_command_filter (empty)\fR"
/* A mechanism to transform commands from remote SMTP clients.
/* .PP
/* Available in Postfix version 2.9 and later:
/* .IP "\fBsmtpd_per_record_deadline (normal: no, overload: yes)\fR"
/* Change the behavior of the smtpd_timeout time limit, from a
/* time limit per read or write system call, to a time limit to read
/* or write a complete record (an SMTP command line, SMTP response
/* line, SMTP message content line, or TLS protocol message).
/* ADDRESS REWRITING CONTROLS
/* .ad
/* .fi
@ -631,6 +638,13 @@
/* The maximal number of new (i.e., uncached) TLS sessions that a
/* remote SMTP client is allowed to negotiate with this service per
/* time unit.
/* .PP
/* Available in Postfix version 2.9 and later:
/* .IP "\fBsmtpd_per_record_deadline (normal: no, overload: yes)\fR"
/* Change the behavior of the smtpd_timeout time limit, from a
/* time limit per read or write system call, to a time limit to read
/* or write a complete record (an SMTP command line, SMTP response
/* line, SMTP message content line, or TLS protocol message).
/* TARPIT CONTROLS
/* .ad
/* .fi
@ -1248,6 +1262,7 @@ char *var_unk_name_tf_act;
char *var_unk_addr_tf_act;
char *var_unv_rcpt_tf_act;
char *var_unv_from_tf_act;
bool var_smtpd_rec_deadline;
int smtpd_proxy_opts;
@ -4338,7 +4353,7 @@ static void smtpd_proto(SMTPD_STATE *state)
* cleans up, but no attempt is made to inform the client of the nature
* of the problem.
*/
smtp_timeout_setup(state->client, var_smtpd_tmout);
smtp_stream_setup(state->client, var_smtpd_tmout, var_smtpd_rec_deadline);
while ((status = vstream_setjmp(state->client)) == SMTP_ERR_NONE)
/* void */ ;
@ -5165,6 +5180,10 @@ int main(int argc, char **argv)
VAR_SMTPD_CLIENT_PORT_LOG, DEF_SMTPD_CLIENT_PORT_LOG, &var_smtpd_client_port_log,
0,
};
static const CONFIG_NBOOL_TABLE nbool_table[] = {
VAR_SMTPD_REC_DEADLINE, DEF_SMTPD_REC_DEADLINE, &var_smtpd_rec_deadline,
0,
};
static const CONFIG_STR_TABLE str_table[] = {
VAR_SMTPD_BANNER, DEF_SMTPD_BANNER, &var_smtpd_banner, 1, 0,
VAR_NOTIFY_CLASSES, DEF_NOTIFY_CLASSES, &var_notify_classes, 0, 0,
@ -5281,6 +5300,7 @@ int main(int argc, char **argv)
MAIL_SERVER_STR_TABLE, str_table,
MAIL_SERVER_RAW_TABLE, raw_table,
MAIL_SERVER_BOOL_TABLE, bool_table,
MAIL_SERVER_NBOOL_TABLE, nbool_table,
MAIL_SERVER_TIME_TABLE, time_table,
MAIL_SERVER_PRE_INIT, pre_jail_init,
MAIL_SERVER_PRE_ACCEPT, pre_accept,

53
postfix/src/tls/tls_bio_ops.c
View File

@ -103,6 +103,19 @@
/* System library. */
#include <sys_defs.h>
#include <sys/time.h>
#ifndef timersub
/* res = a - b */
#define timersub(a, b, res) do { \
(res)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
(res)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
if ((res)->tv_usec < 0) { \
(res)->tv_sec--; \
(res)->tv_usec += 1000000; \
} \
} while (0)
#endif
#ifdef USE_TLS
@ -129,6 +142,24 @@ int tls_bio(int fd, int timeout, TLS_SESS_STATE *TLScontext,
int err;
int retval = 0;
int done;
int enable_deadline;
struct timeval time_limit; /* initial time limit */
struct timeval time_left; /* amount of time left */
struct timeval time_entry; /* time of tls_bio() entry */
struct timeval time_now; /* time after SSL_mumble() call */
struct timeval time_elapsed; /* total elapsed time */
/*
* Deadline management is simpler than with VSTREAMs, because we don't
* need to decrement a per-stream time limit. We just work within the
* budget that is available for this tls_bio() call.
*/
enable_deadline = vstream_fstat(TLScontext->stream, VSTREAM_FLAG_DEADLINE);
if (enable_deadline) {
time_limit.tv_sec = timeout;
time_limit.tv_usec = 0;
GETTIMEOFDAY(&time_entry);
}
/*
* If necessary, retry the SSL handshake or read/write operation after
@ -194,12 +225,24 @@ int tls_bio(int fd, int timeout, TLS_SESS_STATE *TLScontext,
done = 1;
break;
case SSL_ERROR_WANT_WRITE:
if (write_wait(fd, timeout) < 0)
return (-1); /* timeout error */
break;
case SSL_ERROR_WANT_READ:
if (read_wait(fd, timeout) < 0)
return (-1); /* timeout error */
if (enable_deadline) {
GETTIMEOFDAY(&time_now);
timersub(&time_now, &time_entry, &time_elapsed);
timersub(&time_limit, &time_elapsed, &time_left);
timeout = time_left.tv_sec + (time_left.tv_usec > 0);
if (timeout <= 0) {
errno = ETIMEDOUT;
return (-1);
}
}
if (err == SSL_ERROR_WANT_WRITE) {
if (write_wait(fd, timeout) < 0)
return (-1); /* timeout error */
} else {
if (read_wait(fd, timeout) < 0)
return (-1); /* timeout error */
}
break;
/*

52
postfix/src/util/vstream.c
View File

@ -138,6 +138,10 @@
/*
/* int vstream_wr_timeout(stream)
/* VSTREAM *stream;
/*
/* int vstream_fstat(stream, flags)
/* VSTREAM *stream;
/* int flags;
/* DESCRIPTION
/* The \fIvstream\fR module implements light-weight buffered I/O
/* similar to the standard I/O routines.
@ -298,7 +302,7 @@
/* .IP "VSTREAM_CTL_TIMEOUT (int)
/* The deadline for a descriptor to become readable in case of a read
/* request, or writable in case of a write request. Specify a value
/* <= 0 to disable deadlines.
/* of 0 to disable deadlines.
/* .IP "VSTREAM_CTL_EXCEPT (no value)"
/* Enable exception handling with vstream_setjmp() and vstream_longjmp().
/* This involves allocation of additional memory that normally isn't
@ -319,12 +323,14 @@
/* int. Use an explicit cast to avoid problems on LP64
/* environments and other environments where ssize_t is larger
/* than int.
/* .IP "VSTREAM_CTL_TIME_LIMIT (int)"
/* Specify an upper bound on the total time to complete all
/* subsequent read or write operations. This is different from
/* VSTREAM_CTL_TIMEOUT, which specifies a deadline for each
/* read or write operation. Specify a relative time in seconds,
/* or zero to disable this feature.
/* .IP VSTREAM_CTL_START_DEADLINE
/* Change the VSTREAM_CTL_TIMEOUT behavior, to limit the total
/* time for all subsequent file descriptor read or write
/* operations, and recharge the deadline timer.
/* .IP VSTREAM_CTL_STOP_DEADLINE
/* Revert VSTREAM_CTL_TIMEOUT behavior to the default, i.e.
/* a time limit for individual file descriptor read or write
/* operations.
/* .PP
/* vstream_fileno() gives access to the file handle associated with
/* a buffered stream. With streams that have separate read/write
@ -402,6 +408,15 @@
/*
/* vstream_rd_mumble() and vstream_wr_mumble() report on
/* read and write error conditions, respectively.
/*
/* vstream_fstat() queries stream status information about
/* user-requested features. The \fIflags\fR argument is the
/* bitwise OR of one or more of the following, and the result
/* value is the bitwise OR of the features that are activated.
/* .IP VSTREAM_FLAG_DEADLINE
/* The deadline feature is activated.
/* .IP VSTREAM_FLAG_DOUBLE
/* The double-buffering feature is activated.
/* DIAGNOSTICS
/* Panics: interface violations. Fatal errors: out of memory.
/* SEE ALSO
@ -1314,7 +1329,6 @@ void vstream_control(VSTREAM *stream, int name,...)
int old_fd;
ssize_t req_bufsize = 0;
VSTREAM *stream2;
int time_limit;
#define SWAP(type,a,b) do { type temp = (a); (a) = (b); (b) = (temp); } while (0)
@ -1377,6 +1391,8 @@ void vstream_control(VSTREAM *stream, int name,...)
if (stream->timeout == 0)
GETTIMEOFDAY(&stream->iotime);
stream->timeout = va_arg(ap, int);
if (stream->timeout < 0)
msg_panic("%s: bad timeout %d", myname, stream->timeout);
break;
case VSTREAM_CTL_EXCEPT:
if (stream->jbuf == 0)
@ -1428,17 +1444,15 @@ void vstream_control(VSTREAM *stream, int name,...)
* that we need to do I/O. This avoids a performance hit when
* sending or receiving body content one line at a time.
*/
case VSTREAM_CTL_TIME_LIMIT:
time_limit = va_arg(ap, int);
if (time_limit < 0) {
msg_panic("%s: bad time limit: %d", myname, time_limit);
} else if (time_limit == 0) {
stream->buf.flags &= ~VSTREAM_FLAG_DEADLINE;
} else {
stream->buf.flags |= VSTREAM_FLAG_DEADLINE;
stream->time_limit.tv_sec = time_limit;
stream->time_limit.tv_usec = 0;
}
case VSTREAM_CTL_STOP_DEADLINE:
stream->buf.flags &= ~VSTREAM_FLAG_DEADLINE;
break;
case VSTREAM_CTL_START_DEADLINE:
if (stream->timeout <= 0)
msg_panic("%s: bad timeout %d", myname, stream->timeout);
stream->buf.flags |= VSTREAM_FLAG_DEADLINE;
stream->time_limit.tv_sec = stream->timeout;
stream->time_limit.tv_usec = 0;
break;
default:
msg_panic("%s: bad name %d", myname, name);

5
postfix/src/util/vstream.h
View File

@ -126,6 +126,8 @@ extern int vstream_fdclose(VSTREAM *);
#define vstream_ftime(vp) ((time_t) ((vp)->iotime.tv_sec))
#define vstream_ftimeval(vp) ((vp)->iotime)
#define vstream_fstat(vp, fl) ((vp)->buf.flags & (fl))
extern void vstream_control(VSTREAM *, int,...);
#define VSTREAM_CTL_END 0
@ -144,7 +146,8 @@ extern void vstream_control(VSTREAM *, int,...);
#endif
#define VSTREAM_CTL_BUFSIZE 12
#define VSTREAM_CTL_SWAP_FD 13
#define VSTREAM_CTL_TIME_LIMIT 14
#define VSTREAM_CTL_START_DEADLINE 14
#define VSTREAM_CTL_STOP_DEADLINE 15
extern VSTREAM *PRINTFLIKE(1, 2) vstream_printf(const char *,...);
extern VSTREAM *PRINTFLIKE(2, 3) vstream_fprintf(VSTREAM *, const char *,...);