Merge branch 'master' into aravindhr/add-zone-sync-scheduler-config

modules/docs/src/main/mdoc/operator/config-api.md

@@ -483,6 +483,16 @@ sns {
   }
 }
 ```
+### Email Domain Configuration
+ This configuration setting determines the valid domains which are 
+ allowed in the email fields. `*dummy.com` means it will allow any 
+ subdomain within dummy.com like apac.dummy.com. If email-domains is
+ left empty then it will accept any domain name.
+```yaml
+valid-email-config {
+   email-domains = ["test.com","*dummy.com"]
+}
+  ``` 
 
 ### Batch Manual Review Enabled <a id="manual-review" />
 
@@ -760,6 +770,11 @@ dotted-hosts = {
      }
   }
 
+  # Valid Email Domains
+  valid-email-config {
+    email-domains = ["test.com","*dummy.com"]
+  } 
+
   sns {
      # Path to notifier provider implementation
      class-name = "vinyldns.api.notifier.sns.SnsNotifierProvider"