Defining an SMTP Route

The Email Security appliance routes mail to local domains to hosts specified using the Management Appliance > Network > SMTP Routes page (or the smtproutes command). This feature is similar to the sendmail mailer table feature. (The SMTP Routes page and smtproutes command are an expansion of the AsyncOS 2.0 Domain Redirect feature.):

Use the Management Appliance > Network > SMTP Routes page (or the smtproutes command) to construct routes. When you create a new route, you first specify the domain or partial domain for which you want to create a permanent route. You then specify destination hosts. Destination hosts can be entered as fully-qualified hostnames or as IP addresses. You can also specify a a special destination host of /dev/null to drop the messages that match the entry. (So, in effect, specifying /dev/null for the default route is will ensure that no mail received by the appliance is ever delivered.)

Multiple destination host entries can contain both fully-qualified hostnames and IP addresses. Separate multiple entries with commas.

If one or more of the hosts are not responding, messages will be delivered to one of the reachable hosts. If all the configured hosts are not responding, mail will be queued for that host (does not fail over to using MX records).