greylisting

(redirected from Grey listing)

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 email addresses of the sender and the email 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 ?
Recent grey listing is part of US' new Afghan strategy to put pressure on Pakistan,' he added.
Ismail, who himself owns a company that exports goods (Ismail Industries, a confectionary manufacturer), did acknowledge that there is a reputational risk associated with a grey listing.
LAHORE:When Foreign Minister Khawaja Asif tweeted on February 21 about the Financial Action Task Force (FATF) failing to achieve consensus on grey listing Pakistan and the matter being put off for another three months, it seemed as if the imminent challenge had been delayed and everyone heaved a sigh of relief.
Recent grey listing is part of US's New Afgh stgy to put pressure on Pak.
The last grey listing happened due to a failure to pass the Anti Money Laundering and Countering Financing of Terrorism Act.
And Miftah Ismail is outright wrong in dismissing the impact of a possible FATF grey listing.
Pakistan has been narrowly escaping grey listing since last year by taking tentative measures.
The government believes that the FATF review and call for grey listing was nothing but a political witch-hunt for not submitting to US and Indian dictates.