Plugin details: greylisting-spp 

greylisting-spp details

"greylisting" ( is the concept of temporarily rejecting an incoming email, unless delivery of the same email has been tried before. The idea of greylisting is that typical malware like spam senders or email worms / virii typically do not implement a proper mailqueue and will therefore not try delivery again if the first attempt failed. Thus, greylisting can stop SPAM and/or malware at the earliest possible time, i. e. before the actual content is being received by the target MTA.

Author: Peter Conrad
Added on: 2004-08-29

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Copyright © 2004-2008 Paweł Foremski

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license can be found here.