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Defer smtp clients with too many wrong ids

From: ram (ramnetcore.co.in)
Date: Mon Mar 03 2008 - 03:08:02 CST


On my postfix 2.4.3 servers I maintain a list of users for most domains
I accept mail for. So I am able to reject SMTP connections to incorrect
ids right after RCPT-TO

I would like to send a TEMPFAIL to all smtp clients who have been
bombarding my servers with undeliverable mails ( atleast attempting to )
in the last half hour
That way I would be rejecting a lot of spams wth TEMPFAIL and by the
time the ip is "released" it would have got listed in rbls
(I believe yahoo does something similar too. )

Is there a postfix implementation for this I could use

Thanks
Ram