While on the subject of preventing spam, could someone please share horror/success stories of using Sender Address Verification [ala callbacks in Exim] before accepting mails?
Some people seem to like it. But speaking as a provider whose domains are very often forged into spam, I would say "don't use callbacks - it puts a huge load on such domains".
There are several other checks (such as a bunch of helo and forged header checks that you can get from the spamassasin 3.x package / cvs tree) that will stop a whole lot of forged spam for you.
Ditto with using xbl.spamhaus.org
srs
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