greylisting


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greylisting

A spam prevention method in which the receiving mail server rejects a message the first time it is received. The sending server of a legitimate user will eventually retransmit the message. However, the servers that spammers use generally will not because the spammer's goal is to disseminate millions of messages quickly and not have to keep track of which ones fail to reach their destination.

Based on the "Triplet"
When a message is received, the greylisting routine checks the IP and e-mail addresses of the sender and the e-mail address of the receiver (the "triplet"). If the triplet has been accepted before, the message is accepted again. If not, the receiving server sends a "busy" message to the sending server. See blacklist and spam filter.
References in periodicals archive ?
Clearswift have also added Greylisting to the battery of anti-spam tools present in the MIMEsweeper Email Appliance, and integrated it with the TRUSTmanager reputation service to avoid legitimate email from being delayed.
This newest version of SmarterMail stays on the forefront of protection by providing fully-integrated SpamAssassin, Greylisting, Outbound Spam Checks, and ClamAV virus protection right out of the box.
By leveraging SPF, MDaemon removes some of the core concerns that have plagued other greylisting implementations in the past.
0 improves upon some of its most valuable core features, including greylisting and optional outbound mail scanning.