Selective Domain Filtering with Postfix and a SPAM Filtering Service standard
Yes, that title was a mouthful, but I’m trying to make sure I’m descriptive enough for the next guy who is in this situation. I was facing something interesting lately. There is a spambot network that is ignoring whatever you put in the MX record, and trying to send emails to other IPs associated with the domain. Yep, rookie mistake on my part. Should have set things up so that domains forwarding to my spam filtering service can only be delivered locally if they come FROM that service. So I turned to the extremely helpful Postfix Users group. Essentially, they suggested leveraging access(5) rules to define this in main.cf. You could throw the domains into a hash table as well, ...
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