What is the meaning of Greylisting?

Greylisting is an anti-spam technique to ensure email owners do not get unsolicited messages by temporarily rejecting any email coming in from a strange sender. Once rejected, the system notifies the sender to resend the email after a few minutes. Your mail server will reattempt the sending until it is rejected or accepted by the receiver.

You may also want to know about anti-greylisting.

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