I have 3 mail servers, 2 IMail servers in the DMZ (10.2.2.5, 10.2.2.6) and one in our Internal Network (192.168.0.4). I have setup definitions for each machine and setup DNAT rules to redirect the external SMTP requests to the appropriate private IPs. Each mail server is able to receive mail from the External Network, however the mail servers in the DMZ are unable to send mail to the mail server on the Internal Network. Is setting up SNAT rules for outgoing SMTP from the DMZ servers to their MX equivelant IPs the solution to this problem?
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