Plugin details: mfdnscheck 

mfdnscheck details

This plug-in can be used to stop some sort of spam - it checks whether envelope sender domain exists and has valid MX set in DNS.

Imported from Helios qmail .

Author: Pawel Foremski
Added on: 2004-07-09
URL: /downloads/show_src.php?file=mfdnscheck_php

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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.