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 ?
Applications not yet classified run in a greylist mode and are automatically evaluated and assigned to a white/black list.
Considering the scrutiny the IRS is placing on offshore business locations and that the TCI is on the OECD greylist, the domicile has its work cut out for itself in order to remove any "tax haven" connotations.
Exception options and white lists can exempt trusted senders from greylist processing.