Was wondering if you had taken a look at something called SpamCannibal at http://www.spamcannibal.org .
no, but it sounds ok
It is something akin to the Anvil feature you describe, but with a twist. The stated aim of the daemon on its website is, "SpamCannibal's TCP/IP tarpit stops spam by telling the spam server to send very small packets. SpamCannibal then causes the spam server to retry sending over and over - ideally bringing the spam server to a virtual halt for a long time or perhaps indefinitely."
I'm not in favor of counter-attacking with tarpitting.
postfix has several interface points in the SMTP session. a recent one is a policy/proxy service hook, where somebody could write a spamcannibal equivalent.
I AM in favor of DoSing all websites that spamvertize.
I haven't tried setting up a Postfix box for this yet, but it sounds like fun. :-)
ask on the postfix list if anybody has setup spamcannibal as postfix policy/proxy service.
Len
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