All: Long time postfix user. I have an internet facing mail server running Postfix. For about half of my domains, I have them run through a spam filtering service (like MimeCast/Proofpoint). The other half just come direct because they are either very low volume or are used for testing/automation.
There is a spam network that has figured out that they can bypass my spam filtering service by ignoring the MX record and just sending mail directly to the mail server. Pretty sneaky. So what I’m trying to devise is a strategy that would allow me to reject email for some domains if it didn’t come through the spam filtering service, but allow messages for other domains to be delivered that I don’t have going through the spam service. Ideally, there would be some kind of hash map that would basically say if the domain is present in the map it must come through a defined relayhost. Or maybe there is a custom milter strategy. Open to any and all ideas! Best, B Williams
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