The challenge-response content-filtering technique uses a black list as the basis for a confirmation procedure.

Name: The challenge-response content-filtering technique uses a black list as the basis for a confirmation procedure.
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Quizplus · Accepted Answer

The challenge-response content-filtering technique uses a challenge-response mechanism where the sender must respond to a challenge before the email is delivered. It does not use a black list as the basis for confirmation.

The Challenge-Response Content-Filtering Technique Uses a Black List as the Basis