The system works well, but having Interscan in front of Imail hides the connection IP address from Imail DNS Blacklist antispam checker. Since Imail doesn't analyze the headers, it sees only the connection from Interscan which is of course, us.
Unfortunately, that's a drawback of most anti-spam programs -- they only look at the IP that is connecting to the mailserver, and cannot work properly with mail from gateways or backup mailservers. The only ways around that would be to either get an anti-spam program that can handle gateways/backups (such as Declude JunkMail Pro), or find a way of changing the IP before IMail sees it (I'm not aware of any programs that do that, but there may be).
-Scott
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