John Levine wrote:
mail.) I also routinely observe that I send mail, I get a challenge
that I ignore, and a few minutes later I get a live response because
C/R users know that their systems are broken and read their challenged
mail anyway.
I'm in no way a C/R supporter, but I have done some experiments with C/R
in that past. One "enhancement" I quickly discovered was using VERP
tagging on the challenges, and dropping messages from the pending queue
when the challenge bounced. This cut the pending queue by more then 90%.
Used with a SpamAssassin setup that rejects everything with a score
above 5 and challenges anything with a score between 5 and 3, and you
have a pretty functional spam-filter. It's still evil cost-shifting, but
pretty functional :-)
Bob
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