I know this is off-topic, but I've attempted numerous times to put our server behind a firewall, but upon doing so, the queue grows to an enormous proportion and the only way to clear it is to remove it from behind the firewall.
Besides the normal ports 25, 110 and 80 (for web mail), do I also have to keep 1024-65525 open as well for iMail to work properly? Seems stupid to do since normal standardized e-mail should only use the above mentioned three ports (sendmail does).
Where does your DNS server sit? If it isn't behind the firewall, you're gonna have to open up ports for DNS. I would recommend udp from mail IP src port 1024-65525 to DNS ip dst port 53. And also the opposite of that, udp from DNS IP src port 53 to mail ip dst port 1024-65525. As a side note, you won't need the reverse rule if your firewall can do UDP stateful inspection.
Also, a big clue would be in your IMail logs. Post a clip of those, and I'm sure you'll find your answer.
-Russ
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