Re: [Asrg] Unique innovations made to anti-spam system

["B. Johannessen" <bob at db.org>]

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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