I recently started rejecting about 99.9% of incoming spam *without* using 
challenge-response or other load-increasing methods.  For details, read:


In a nutshell, before implementing this plan, I was receiving about 600 
emails and 50 spams per day.  Afterward, I'm receiving about 600 emails and 
1 spam (yes, one) per day.  In other words, I don't seem to be having any 
false positives at all.
Kirk Strauser

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