[Mimedefang] OT - MS Exchange 2003 SP2 and greylisting

Kevin A. McGrail kmcgrail at pccc.com
Sun Jun 17 10:27:41 EDT 2007


We have a server just patched to SP2 having issues with Merak's Greylisting 
implementation as well.  This fits with your discussion notes below because 
it looks like a pre-DATA phase greylisting technique.

Is there any sign that Microsoft will patch or does this effectively kill 
RCPT TO level greylisting?


> I have just published a post at www.greylisting.org about a bug in MS 
> Exchange 2003 SP2,
> that sometimes fails to retry mails to greylisting hosts.
> This isn't related directly to MD but I know that some MD users also 
> implement greylisting,
> and I think that it is important to know about this bug.
> Here is the link to my recent post about this problem:
> MS Exchange 2003 SP2 bug related to greylisting:
> http://www.greylisting.org/forums/showthread.php?tid=18
> If you are using greylisting - please also read the links in the 
> discussion itself.
> BTW - I have noticed the problem (at the sender side) against hosts that 
> do greylisting at the "RCPT TO" stage,
> and haven't noticed it against hosts that greylist after DATA (such as 
> Canit).
> That doesn't mean much because greylisting at DATA isn't common, but I 
> think that it worth to mention.
> BTW #2 - We have already disussed this problem here on the list at 
> Feb-2006:
> [Mimedefang] Re: Justifying greylisting to management:
> http://lists.roaringpenguin.com/pipermail/mimedefang/2006-February/029632.html
> I don't want to raise the argue about how good or bad greylisting is,
> just to mention the technical details to you all.
> I want to let you know that there is still a bug in MS Exchange 2003 SP2 
> at the sending side,
> and that the bug is sporadic, difficult to predict or track, so that you 
> should be aware of it,
> and know what to tell to the innocent Exchange admin that doesn't 
> understand what happend,
> and why his users complain about old emails being delayed for several 
> weeks.

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