How to set mail server ip when I set OPOSense as mail gateway?

[akong77]

Hello,
I have see follow tutorial.
https://wiki.opnsense.org/manual/how-tos/mailgateway.html
But I don't see where to set mail server ip address.

[mimugmail]

The Firewall will listen on all IP addresses.
What's your plan? Forward all messages to a specific host? Then you have to set a smart host in postfix plugin.
If you want a Antispam solution for incoming mail, set up like in the howto and in domains menu, add your domain and the internal IP of your mailserver

[akong77]

OK,Thanks a lot.
I will try set it.I also want know have a mail log at opnsense gui?Could I view all mail filter log?