helodnscheck (C version) details
Compile it and place it in the [helo] section.
Compile as follows:
gcc -o helodnscheck helodnscheck.c -lresolv
Note: If there is no HELO/EHLO argument, it defaults to a permanent block. If this is not what you want, then comment out the block_permanent() call when it checks for helo_domain.
Author: Jason Frisvold
Added on: 2007-01-17
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Copyright © 2004-2008 PaweĊ 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.