diff --git a/postfix/HISTORY b/postfix/HISTORY
index 9c20918b4..55b3c66dc 100644
--- a/postfix/HISTORY
+++ b/postfix/HISTORY
@@ -13248,7 +13248,7 @@ Apologies for any names omitted.
 	cleanup/cleanup_final.c, cleanup/cleanup_bounce.c,
 	cleanup/cleanup_api.c.
 
-20050217
+20070217
 
 	Streamline the compile time selection of event handling
 	styles, replacing multiple on/off macros by just one
@@ -13657,3 +13657,9 @@ Apologies for any names omitted.
 	implement a denial of service attack on Postfix. Data
 	confidentiality and integrity are not affected.  File:
 	util/events.c.
+
+20081203
+
+	Cleanup: adjust the VSTREAM buffer strategy when reusing
+	an SMTP connection with a large TCP MSS value. File:
+	smtp/smtp_reuse.c.
diff --git a/postfix/src/global/mail_version.h b/postfix/src/global/mail_version.h
index 312749536..281bda442 100644
--- a/postfix/src/global/mail_version.h
+++ b/postfix/src/global/mail_version.h
@@ -20,8 +20,8 @@
   * Patches change both the patchlevel and the release date. Snapshots have no
   * patchlevel; they change the release date only.
   */
-#define MAIL_RELEASE_DATE	"20080902"
-#define MAIL_VERSION_NUMBER	"2.4.9"
+#define MAIL_RELEASE_DATE	"20090103"
+#define MAIL_VERSION_NUMBER	"2.4.10"
 
 #ifdef SNAPSHOT
 # define MAIL_VERSION_DATE	"-" MAIL_RELEASE_DATE
diff --git a/postfix/src/smtp/smtp_reuse.c b/postfix/src/smtp/smtp_reuse.c
index 1ed72d73b..0eb989f18 100644
--- a/postfix/src/smtp/smtp_reuse.c
+++ b/postfix/src/smtp/smtp_reuse.c
@@ -213,6 +213,11 @@ static SMTP_SESSION *smtp_reuse_common(SMTP_STATE *state, int fd,
 	return (state->session = 0);
     }
 
+    /*
+     * Avoid poor performance when TCP MSS > VSTREAM_BUFSIZE.
+     */
+    vstream_tweak_sock(session->stream);
+
     /*
      * Update the list of used cached addresses.
      */