On Tue, 4 Mar 2003, Mark Delany wrote:
How do you differentiate between list-washing and spam delivery attempts?
I don't, and I don't care. Either way, it fails at RCPT TO:
However, grepping through my mail logs, I don't see any obvious
dictionary attacks. I know other users who have reported this, but I
don't see it. Besides, this technique has the pleasant side-effect of
stopping dictionary attacks too, unless the attacker makes a second attempt
for each recipient address. Also, by watching the size of your "one-shot"
database, it quickly becomes apparent when you're under dictionary attack,
and you can block the offender.
Regards,
David.
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