I've been giving more thought to how to slow down spamming. It seems we
should just follow 7.3 of RFC2821 - return either 250 or 252 to VRFY and
EXPN commands. In this way the sender can't find out if someone is
really on a system.
Second I would kick back a 551 to every message being sent by a
domain/user I don't recognize or wanted to reject as SPAM. In the former
case I would send the email to the real recipient allowing them to
decide what to do with it. I the latter case I would just toss it or
fill in the subject with SPAM:.
Thoughts?
Chuck Wegrzyn
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