How to stop message from attempting to be delivered in Exchange 2003

We are running Exchange 2003.  A couple of weeks ago, one of our users sent a message to 3 other users.  She received a message "The destination server for this recipient could not be found in Domain Name Service (DNS).  Please verify the email address and retry.  If that fails, contact your administrator."  It was only for this particular message.  She had previously sent messages to them with no problem, and has since been able to.  It was only this one message.  The proble is that she is now receiving the same message with the same error muliple times a day, regarding the same original message.  Is there anyway to stop this one message from attempting to be delivered.  Hope that wasn't to confusing.  Thanks.
TOHITAsked:
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
Sounds like it might be the greylisting bug.
This is where the message gets stuck in the hidden queue and reprocessed again and again.

Install the hotfix I have linked to from my blog here:
http://blog.sembee.co.uk/post/Hotfix-for-the-Exchange-2003-Greylisting-Bug.aspx

Then restart the SMTP Server service.

Simon.
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RobinHumanConnect With a Mentor Commented:
Check your mail queues (should be listed as queue off the exchange install directory, identify the fasulting message by opening with outlook express on the exchange server, and delete it from the mail queue
Hope this helps you
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TOHITAuthor Commented:
Thanks, but I don't see it in the queue.  And the frequency isn't predictable.  Sometimes it's 40 minutes, sometimes a couple of hours, just random periods of time between them.
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RobinHumanCommented:
Try recreating the users profile - it could be thast something got corrupted there
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TOHITAuthor Commented:
I tried recreating the profile and runing the hotfix.  Neither worked.  I totally befuddled.
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TOHITAuthor Commented:
It eventually stopped.  I guess I'll chalk it up to the hotfix..
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