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What is Greylisting?
The term 'Greylisting' is meant to describe a general method of blocking spam based on the behavior of the sending server, rather than the content of the messages.
When mail is received from a foreign host for the first time, the mail is temporarily rejected. If it is a valid mail server, it will retry the delivery after a predetermined time. On the second delivery attempt of the sending server the mail server will accept the email and whitelist the domain for future mail deliveries.
Spam servers do not retry delivery of a mail that was rejected.
When mail is received from a foreign host for the first time, the mail is temporarily rejected. If it is a valid mail server, it will retry the delivery after a predetermined time. On the second delivery attempt of the sending server the mail server will accept the email and whitelist the domain for future mail deliveries.
Spam servers do not retry delivery of a mail that was rejected.
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