Challenge-Response Harmful to Mailing Lists

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Link: TidBITS Policy on Challenge-Response

I recently blogged an argument against challenge-response anti-spam systems. I was glad to see it, but concerned it may be a tad inscrutable to the non-technical reader. Then I saw this article, explaining the policy of the TidBITS mailing list, and thought it did a good job of breaking down some of the problem.