Challenge–response spam filtering

A challenge–response (or C/R) system is a type of spam filter that automatically sends a reply with a challenge to the (alleged) sender of an incoming e-mail. It was originally designed in 1997 by Stan Weatherby, and was called Email Verification.

Source: Wikipedia — Challenge–response spam filtering (CC BY-SA 4.0)

Challenge–response spam filtering

A challenge–response (or C/R) system is a type of spam filter that automatically sends a reply with a challenge to the (alleged) sender of an incoming e-mail. It was originally designed in 1997 by Stan Weatherby, and was called Email Verification.

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Source: Wikipedia "Challenge–response spam filtering" · CC BY-SA 4.0

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