More Complex Mail Routing

In this example, inbound and outbound email are handled by separate servers in the network.

Incoming mail is routed through a firewall to the Email Appliance, and then forwarded to a mail hub where it is retrieved by clients. Outbound email is routed through an SMTP relay before being sent out to the Email Appliance. Local email can be diverted from the outbound SMTP relay directly to the mail hub, or through the Email Appliance for policy filtering. The domain controller provides the Email Appliance with user information, which allows it to reject messages to invalid users at the gateway.

With the exception of quarantined email, messages are not stored on the Email Appliance.

Mail routing is configured on the Configuration > Routing page.