I have a user that is experiencing what some call a loop back issue. The user receives email with out a problem and then one day he gets the same email over and over again. Anywhere between 20 to 100's of the same email delivered at the same time of day.
The first thing to do is check the headers of several of the repeated E-mails. The Received: headers will typically help pinpoint where the mail loop is occurring. For example, if you see "Received: from Machine1..." followed by "Received: from Machine2..." and then "Received: from Machine1...", the loop is occurring between Machine1 and Machine2.
If that doesn't get anywhere, and/or you are convinced that the issue is at the IMail server, you can check the IMail SMTP log files to see how many times the E-mail was received, and how many times it was delivered/sent.
-Scott
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