I have the slight feeling that any incoming email relayed to Imail by it's own IP address (i.e. relayed by our antivirus SMTP service) is trusted and not scanned.
Can anyone shed any light on this?
You figured out the problem.
Most basic anti-spam programs can only run spam tests based on the IP address of the mailserver that connects to it. If you have a gateway or a backup mailserver, you need to either:
[1] Run advanced anti-spam software that handles gateways/backups, or [2] Run anti-spam software on the gateway/backups, or [3] Accept spam that comes through the gateway/backups.
There are some spam tests that don't require the IP address, however. But the most well known spam tests are the public spam databases, that work almost exclusively based on the IP address of the sender.
-Scott
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