Greylist – a free grey list for Exchange.

I know – I know – I know. Programs don’t really fit into Grynx’s profile – but hey – I make’ed something and now I’m sharing it with you. It might not interest you that much if you’re not an Exchange admin or have an Exchange server, but that’s just the way things are. Greylist is simply a greylist program for Exchange 2003 ( should work on 2000 ) which will delay incoming mail for a couple of minutes. In my environment it blocks 98% of all spam and so far it hasn’t blocked a single ‘good’ email. And as I like the whole idea of open source, I’m publishing it just like that – for free. Or rather freeware. I wrote this as I couldn’t find any free grey list programs out there. Lots and lots for free for Linux, but only commercial products for Exchange. Link: Greylist v1.0 for Exchange

7 Responses to “Greylist – a free grey list for Exchange.”

1. Heywood J. Blaume Says:
   October 10th, 2006 at 12:11

   This thing is fantastic. I was struggling with configuring an upstream Postfix-based greylisting SMTP server for my small Exchange server environment, but I found this and it works exactly as advertised. Thanks so much for your contribution.

2. Loris Says:
   November 21st, 2006 at 17:48

   Hi Chris,

   Great piece of software. The only problem with it: it doesn’t run
   as smooth as it could on non-US locales. The admin returns:
   Syntax error in date in query expression ‘#22.11.2006#’ (swiss locale).

   Hope you can fix this. I would love to take this productive.

   Cheers
   Loris

3. Mike Verheul Says:
   November 24th, 2006 at 6:24

   Hello,

   Seems to work like a charm.
   Only thing is that the ‘disconnect’ message on internet is “451 Requested action aborted: local error in processing” and not the message as said in the readme.

   But works like a charm! Thanks

4. Chris J. Says:
   November 24th, 2006 at 6:36

   Mike: The wording doesn’t really matter as the piece that matters is the 451. This is what the sending mail server uses to determine the error.

5. Uttang Dawda Says:
   December 11th, 2006 at 7:16

   Perfect . A impressive peice of code.
   I was wondering if this worked with Exchange 5.5(my company is on a tight budget).
   Thanks NEways will surely contribute towards this site ( My pocket isnt so small as my company:D)

6. Chris J Says:
   January 5th, 2007 at 18:30

   Hi there. I do not get the 451 code that is needed to let the sending server know that it is “delayed”. I get a very snappy disconnect.

7. Enrique Q Says:
   January 20th, 2007 at 17:57

   Great little application! Very effective implementation of a simple concept. Currently testing on 5 different Exchange servers and no complaints, if no major issues arise in the next two weeks, expect five registrations for your product.

   Many thanks,
   Enrique

   P.S. Chris J., please troubleshoot your own server…

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