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 ?
The EU Ambassador also congratulated the Finance Minister that due to active policy measures taken by the government, mainly spearheaded by the Finance Ministry to curb terrorist financing and due to spirited anti-money laundering drive, Pakistan had been taken off the grey list of the Financial Action Task Force (FATF).
It may be added that FATF, the international body which sets standards for AML/CTF, placed Pakistan on its Grey list in February 2012 which meant that the country was not fully compliant with the standards set by FATF for effectively combating the twin menaces of money laundering and terrorist financing.
This is a big breakthrough for the half-Kazakh company as it took it years of hard work to be off the EU's grey list of airlines subject to limitations.
Eventually, Cyprus was moved in 2004 from black list to the grey list in the Paris Memorandum of Understanding (MoU) on port state control, and later to the white list in 2005.
Continuing the fight against fraud, LinkTrust customers can now block search spiders and screen scraper bots before they affect their stats with the new User Agent Black & Grey list.
London, Mar 22, 2012 - (ACN Newswire) - After Switzerland was placed on the Organisation for Economic Co-operation and Development's (OECD) grey list in 2009, there has been a move to make the tax environment even more attractive than before, says Richard Wuermli, Managing Partner, TAX EXPERT International AG.
Argentina is the first G-20 nation to be placed on the Grey List since the FATF's founding.
Belgium ended up on the grey list in April 2009, alongside Austria and Luxembourg and they made their anger quite clear.
At the same time flags at the lower end of the grey list should, according to the MoU committee, be careful not to neglect control over their ships and risk ending up on the black list next year.
The bank's chief executive officer, Baudouin Prot, said, 'We have decided to close our filiations in tax heavens, those countries which remained in the grey list of the Organization for Economics Co-operation and Development (OECD).
Due to its efforts to extend its tax information exchange network, Bahrain has moved out of the so-called grey list into the list of jurisdictions that have substantially implemented the internationally agreed tax standard.
Countries on the grey list include the more famous tax havens known to many of us: the Cayman Islands, Monaco, Liechtenstein and Switzerland.