I've been following the thread about TMDA with some interest, mainly because
I recently started rejecting about 99.9% of incoming spam *without* using
challenge-response or other load-increasing methods. For details, read:
http://subwiki.honeypot.net/cgi-bin/view/Freebsd/FilterMailWithPostFix
I wrote this article based on my experience on a FreeBSD server, but there's
nothing that couldn't be converted directly for use on a Debian system.
In a nutshell, before implementing this plan, I was receiving about 600
emails and 50 spams per day. Afterward, I'm receiving about 600 emails and
1 spam (yes, one) per day. In other words, I don't seem to be having any
false positives at all.
--
Kirk Strauser
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