K.R. (Randy) Lewis writes:
Examining the logfiles on the smarthost ... where the un-authenticated smtp mail first arrives, I see instances where some bogus / spam / spoof crap has come in, and the server does not forward it to the user's account on the real mta. That's the good part.
Define "does not forward". Explain exactly what mechanism you employ to reject unwanted mail.
However, that user will wind up in the 'LIST' and subsequent emails for him will get bounced with the good old "556 Address unavailable." And, he is in the blaclklist for at least the 2 hours spec'd in the docs.
That means that the mechanism you've implemented involves filtering mail after it is already accepted for delivery to the recipient, and, if rejected by your mail filter, the message gets bounced. Since the message could not be delivered to the recipient, the recipient address gets put on the suppression list. Everything works on intended.
This is not considered a proper way to filter mail. The correct way to implement mail filtering is to reject unwanted mail instead of accepting it and bouncing it after the fact. Courier has several different APIs by which incoming mail can be inspected or filtered before Courier accepts mail from the remote mail server, and, if unwanted, Courier then refuses to accept the message from the remote server.
Just what exact combination of backscatter settings in 'couried' and in 'bofh' (as explained in the docs.) do folks use to minimize these false blacklisting of real users?
If your mail filtering is implemented ex-post-facto, no combination of settings will work correctly, and you must turn it off completely.
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