Allow e-mails to be sent via FW
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How to configure NAT to pass the mail traffic when you have 3 interfaces
1.LAN
2.DMZ
3.WANMail is only working one way either send or receive but not both ways..
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Without giving any information about your setup (No, saying that you have 3 interfaces is NOT giving information) noone will be able to help you.
Start with the basic things like:
How is your network set up (diagram, inclusive the used IPs),
what firewallrules you have where (screenshots of the rules),
NAT-rules (screenshots of them),
how you test (where is the testclient,
to what do you connect),
what you expect,
and what actually happens.