Exchange repeating inbound message every 5 minutes

My client is running Exchange Server 2003. He received an email (with an attachment) from a business associate at 3:54 this morning. Every five minutes since then he has received another copy of the same email. Headers in Outlook show this to be a different message. But when I pull this up in Message Tracking it is the same message that has gotten in a loop and keeps delivering it to the store. The sequence is:

SMTP: Message Submitted to Advanced Queuing
SMTP: Started Message Submission to Advanced Queue
SMTP: Message Sumbitted to Categorizer
SMTP: Message Categorized and Queued for Routing
SMTP: Message Queued for Local Delivery
SMTP: Message Delivered Locally to
SMTP Store Driver: Message Delivered Locally to Store to

Five minutes later it repeats.

I have read posts about using MFCMAP to clear the queues, but I have never been in there before. I looked around in the SMTP TempTables but find no sign of this message.

Thoughts? Suggestions?
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ITnavigatorsAuthor Commented:
One other thought.  The messages keep repeating even if Outlook is not open.
ITnavigatorsAuthor Commented:
Received another message from the same sender.  It broke the loop and the repeating stopped.

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