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   This does not affect SpamFilter UNLESS a buggy Microsoft Windows 2003 SMTP (with or without Exchange) Server tries sending email to your SpamFilter that is using Greylisting: 

MS Article 934709

On a Windows Server 2003-based SMTP gateway server, some messages may remain in the queue folder until the SMTP service is restarted.

SYMPTOMS

On a Microsoft Windows Server 2003-based SMTP gateway server, some messages may unexpectedly remain in the queue folder until the SMTP service is restarted. After the SMTP service is restarted, all idle messages in the queue folder are processed correctly. Specifically, the idle messages are delivered, or non-delivery report (NDR) messages are sent to the mail sender. Therefore, the mail sender may receive an NDR message several days or even several weeks after the sender sends a message.

http://support.microsoft.com/kb/934709/en-us

At this time you have to call Microsoft to get the hotfix.  

Only from the minds of Microsoft  

Edited by pcmatt - 10 January 2008 at 12:02pm

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pcmatt Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 15 February 2005 Location: United States Status: Offline Points: 116	Post Options Post Reply Quote pcmatt Report Post Thanks(0) Quote Reply Topic: GreyListing - Win 2003 SMTP Bug Posted: 09 January 2008 at 2:52pm
	This does not affect SpamFilter UNLESS a buggy Microsoft Windows 2003 SMTP (with or without Exchange) Server tries sending email to your SpamFilter that is using Greylisting: MS Article 934709 On a Windows Server 2003-based SMTP gateway server, some messages may remain in the queue folder until the SMTP service is restarted. SYMPTOMS On a Microsoft Windows Server 2003-based SMTP gateway server, some messages may unexpectedly remain in the queue folder until the SMTP service is restarted. After the SMTP service is restarted, all idle messages in the queue folder are processed correctly. Specifically, the idle messages are delivered, or non-delivery report (NDR) messages are sent to the mail sender. Therefore, the mail sender may receive an NDR message several days or even several weeks after the sender sends a message. http://support.microsoft.com/kb/934709/en-us At this time you have to call Microsoft to get the hotfix. Only from the minds of Microsoft Edited by pcmatt - 10 January 2008 at 12:02pm
	-Matt R

Desperado Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 27 January 2005 Location: United States Status: Offline Points: 1143	Post Options Post Reply Quote Desperado Report Post Thanks(0) Quote Reply Posted: 10 January 2008 at 11:42am
	Matt, THANK YOU for this! This is a very important post as it actually is effecting some of our customers who run Exchange and are haveing issues delivering to MANY services ... not just SpamFilter. The "Hot Fix" does, in fact, cure the issue but why the heck isn't it easily available? Someone needs to shove a broom stick .... never mind! You get the point!
	The Desperado Dan Seligmann. Work: http://www.mags.net Personal: http://www.desperado.com

pcmatt Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 15 February 2005 Location: United States Status: Offline Points: 116	Post Options Post Reply Quote pcmatt Report Post Thanks(0) Quote Reply Posted: 10 January 2008 at 12:01pm
	You are very welcome Desperado. Happy to help; especially someone like you who puts so much into helping others on SpamFilter. I'm sure this will be in the next service pack for Win 2003. Microsoft believes they save support costs by monitoring hotfixes, so they just want to track who's getting it in case they get related support calls. Dunno if I agree with this, but at least the phone lines are generally not bogged down for hotfix requests.
	-Matt R

Simone Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 06 July 2005 Status: Offline Points: 42	Post Options Post Reply Quote Simone Report Post Thanks(0) Quote Reply Posted: 05 February 2008 at 1:26pm
	Thank you Matt, i'm experiencing this problem but i'm not using greylisting at the moment... Do U think that it would be possible to experience this problem also with only limbo cache activated? Thank you, Simone

pcmatt Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 15 February 2005 Location: United States Status: Offline Points: 116	Post Options Post Reply Quote pcmatt Report Post Thanks(0) Quote Reply Posted: 05 February 2008 at 1:31pm
	Keeping in mind that this is not a SpamFilter issue, this is a problem with MS SMTP. So it doesn't matter what you are doing with SpamFilter, although MS SMTP receivers with the flaw could certainly have troubles. It appears that any delayed or 400 series smtp responses from servers could cause issues for MS SMTP Service. Just became obvious to us when others were using greylisting. MS SMTP with and without Exchange is flawed without the hotfix. I recommend you get the hotfix and try it. It's free other than the phone call. Edited by pcmatt - 05 February 2008 at 1:35pm
	-Matt R

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