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Anytime a specific user sends an email too any other person, that person receives two copies of the email. What conditions could allow this to happen?

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  • What kind of mail system? Exchange? Straight SMTP?
    – squillman
    Aug 6 '10 at 17:32
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This can happen if there are two copies of the OUTLOOK.EXE process running on the machine. Ending one of the processes will stop duplicate mail from being sent out.

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Sounds like you already solved this but for future occurrences, it might also help to see headers.

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Outlook profiles crap out sometimes and give wacky results. Just a general Outlook/Exchange troubleshooting method. When having issues troubleshoot them in Outlook, try to reproduce them in OWA.

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