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Re: TMDA ‹ the Tagged Message Delivery Agent.


Hi Dave,

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).
Thanks for the quick reply.  My employer likes the challenge-response system, which we use for some of our current in-house email addresses (hosted elsewhere), and we'd like to offer it to our clients (we host about 15 websites with corresponding email accounts) on an "opt-in" basis, not force it blindly across the board.

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.)
So, you have the "potentially spam" messages delivered to you, and you hand-enter them into a whitelist?  My biggest concern, of course, is not blocking legitimate mail from our users.  Do you use the self-tuning "spam@" and "notspam@" addresses with SpamAssasin?

If you're interested, I'd be glad to share some of the antispam techniques I
use with Exim. 
I'd love to hear more about your Exim-foo because, frankly, we are getting a lot of spam right now, even after following Apple's (may I interject: pretty shallow) Mail Services guide.  I've moved the SpamAssassin slider down a couple of ticks, but this doesn't really seem to make a difference...


I like the warm fuzzy feeling that comes from collaborating and sharing knowledge, and appreciate yours and other's time investments in this list. :-)

Thanks!

Fred Alger
your friendly local system administrator

 

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 >Re: TMDA ‹ the Tagged Message Delivery Agent. (From: Dave Pooser <email@hidden>)



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