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postfix iptables spam detection


I'm looking for a tool similar to http://www.fail2ban.org/ but for
SMTP protocol.

I have mail server that filters unwanted traffic from spammers quite
well, but some of my clients send tons of spam (of course they're
normally authenticated and let through ) and after it's queued , my
server starts dying because of several thousand emails in mail queue.

I was wondering if there's any tool like fail2ban or policyd-weight
that would ban or blacklist a message before it's queued on the basis
of syslog stats (number of smtp connections per minute etc).


Wojciech Ziniewicz

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