I just went through what sounds like the exact same thing.

What was wrong on this end was, the Internet Mail Service was getting bogged
down. Searching Google got me a couple of entries that identified my problem
exactly. However, the solution they gave (install SP4, which was already
done but I did again anyway) didn't help.

What I found was a message (a 175MB message!) stuck in the Internet Mail
Service queue as "inbound message waiting for conversion". The message was
addressed to an address we no longer had. The message could not be deleted
via the delete button. Nor could it be deleted using Mdbvu32.exe (see
Q165505). The message didn't even show up using this method.

I ended up having to delete the queue.dat file (see Q197792).

Hope this helps.

> -----Original Message-----
> From: Adkins, Matthew [mailto:MAdkinshcr-manorcare.com]
> Sent: Thursday, December 06, 2001 11:38 AM
> To: focus-mssecurityfocus.com
> Subject: Possible exchange attack
>
>
> Does anyone know of an issue with Microsoft Exchange server
> where the server
> is slowed down significantly and some messages are sent out a
> second time an
> hour or more after the original?
>
> Running Exchange on NT 4 with MacAfee Groupshield 4.1.50
> engine, 4.0.4174
> dat file.
>
> Thanks!
>

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