I think I just found the answer:
Rejecting spam during the SMTP dialogue is a different matter: that kind
of
bounce will go to the system that initiated the connection [greatly
reducing
the likelihoods of #1 and #2 above], it will keep the item out of your
mailbox, and it will save the trouble of running the LDA on that piece.
But
once the message gets into procmail's hands, that opportunity has passed,
even more so because the Return-Path: header might be forged and you'll
have
even less chance of sending it to the party that deserves it. Bouncing
spam
from procmail can be pointless or mean, but it can never help. Don't do
it.
I think the way to do this would be with a milter-spamassassin combo. I know
that is off-topic, but if anyone wants to email me off the list to suggest a
combo (for FreeBSD/sendmail) I would appreciate it.
Regards,
John Schneider
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