I have exactly the same problem - I'm using a linux firewall with NAT and I use prot forwarding. I'm guessing that the Imail box sees that forwarded port as coming from itself so it relays.
NAT and port forwarding will work fine. Most likely, the firewall is broken, and doing something wrong (such as NATing the outside world instead of the local network). Also, it's possible that the firewall is acting as a gateway mailserver, in which case IMail will see the IP of the firewall, and the firewall is responsible for all anti-relay settings (by adding a gateway mailserver in front of IMail, you're giving up IMail's ability to block E-mail by IP).
In the end I've restricted access by IP address - trouble is I'm using 10.x.x.x range with a custom subnet mask of 255.255.0.0 and Imail won't accept this....
It won't? I thought IMail would accept all IP ranges using netmasks.
If you post all the Received: headers of a sample incoming E-mail, I can let you know what the firewall is doing.
-Scott
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