Thread-topic: TMDA the Tagged Message Delivery Agent.
User-agent: Microsoft-Entourage/11.2.5.060620
> and whether or not this is even a sane idea.
Challenge-response (one component of TMDA) is an insane idea unless you are
certain that [1] you'll never challenge an innocent third party (hint-- you
will) and [2] people want to give you their business so much that they'll
accept having to jump through some hoops to do so (hint-- they won't).
At the risk of sounding like Dan, a well-configured Exim setup plus a tuned
SpamAssassin install should allow you to safely reject 99% of incoming spam
and tag the remainder for special handling. (I don't quite share Dan's faith
in sender callout verification, however; I've found I have to add 1-2 legit
senders a week to my exempt-from-verification list as some legit bulk mail
will otherwise fail that test.)
If you're interested, I'd be glad to share some of the antispam techniques I
use with Exim.
--
Dave Pooser, ACSA
Manager of Information Services
Alford Media http://www.alfordmedia.com
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