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A comment on Ask HN: Would you use an email presorting service like this?. Parent comment

Re:Ask HN: Would you use an email presorting service like this? by whichdan on Monday December 09, 2013 @09:23PM (#6878584)
http://en.wikipedia.org/wiki/Challenge%E2%80%93response_spam...

Further reading if anyone is interested in challenge-response systems.

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