What is graylisting?

Graylisting is a technique used by some mailbox providers and email receivers to thwart spammers.

A receiving mail server that uses graylisting temporarily rejects any of your email if the server does not recognize you as a sender. The receiver presumes that if you are a legitimate sender, the originating server will try again later to send the email, at which time the receiver will accept it. Graylisting presumes that if you are a spammer, you will not resend your message later.

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