The recent discussion on GreyListing made me think that this is something that
I should really to: take it out of the box marked ''do later''.

I looked at the various implementations suggested for Exim and did not like
any of them and so wrote one that is:

* smaller in terms of exim.conf
* uses an sql procedure - should be faster

I have written it up at the URL below, I have put this up on a test machine and 
it seems
to work.

I would be grateful if this was looked at by the collected wisdom of the 
various readers of this list.
I have marked it beta, I will make changes if you can see bugs or think that 
the documentation
is not good enough.

        http://www.phcomp.co.uk/TechTutorial/HOWTOs/GreyListing.php

Notes for discussion:

* It stores sending-domain & IP address of sender.
  If a site sends from many MTAs it will be greylisted many times.
  The alternative would be to record then entire sender address ([email protected]),
  however I do see spam that supposedly originates from the machine that it
  is being sent to -- so not a good idea.

Regards

-- 
Alain Williams
Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT 
Lecturer.
+44 (0) 787 668 0256  http://www.phcomp.co.uk/
Parliament Hill Computers Ltd. Registration Information: 
http://www.phcomp.co.uk/contact.php
Past chairman of UKUUG: http://www.ukuug.org/
#include <std_disclaimer.h>

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