You can use the Address: Mail From ruleset to put limits on email and to allow email into your network only from specified senders. The default configuration is to allow email from all senders. You can add, delete, or modify rules.
The Address: Rcpt To ruleset can limit the email that goes out of your network to only specified recipients. The default configuration allows email to all recipients out of your network. On an SMTP-Incoming proxy action, you can use the Rcpt To ruleset to make sure your email server can not be used for email relaying. For more information, see Protect Your SMTP Server from Email Relaying.
You can also use the
Other options available in the Mail From and Rcpt To rulesets:
Block source-routed addresses
Select this check box to block a message when the sender address or recipient address contains source routes. A source route identifies the path a message must take when it goes from host to host. The route can identify which mail routers or backbone sites to use.
For example, @backbone.com:email@example.com means that the host named Backbone.com must be used as a relay host to deliver mail to firstname.lastname@example.org. By default, this option is enabled for incoming SMTP packets and disabled for outgoing SMTP packets.
Block 8-bit characters
Select this check box to block a message that has 8-bit characters in the sender user name or recipient user name. This allows an accent on an alphabet character. By default, this option is enabled for incoming SMTP packets and disabled for outgoing SMTP packets.
To configure the SMTP proxy to put limits on the email traffic through your network:
If you modified a predefined proxy action, when you save the changes you are prompted to clone (copy) your settings to a new action.
For more information on predefined proxy actions, see About Proxy Actions.
About the SMTP-Proxy