SMTP Relay for Inside Communication

[amahmud01]

I want to enable SMTP Relay inside my network, ESA is on DMZ  and Servers who is going to Relay inside my Server Farm what will the best practice

Deployment Configuration.

thanks.

[Bob Fayne · Accepted solution]

Best practice is to use two physical interfaces. Have the interface for your public listener in the DMZ and the interface for your private listener inside the firewall. The ESA is by definition a security appliance and will not allow direct communications between networks as it is all SMTP store & forward.

Then when you create a Mail Flow Policy for the Private Listener, use Relay for the connection behavior.