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What exactly do Challenge/Response aliases do?

April 26, 2017Aliases challenge Response

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What exactly do Challenge/Response aliases do?

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Unlike the other types of aliases, Challenge/Response aliases do not treat all incoming mail in the same way. Rather, they forward mail from whitelisted senders to you, bounce or delete mail from blacklisted senders, and challenge unknown senders, thereby giving them a chance to prove they are human and deserve to be whitelisted. This can be used to get rid of spam that is currently sent to you.