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Jason MillsappsFlag for United States of America

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Spoofed emails on exchange 2003

We are using Exchange 2003. I have 1 user who seems to have had his email address spoofed and has gotten several thousand returned emails in the past 2 days on his exchange account. After several malware/virus scans, I am certain that there are no viruses on his pc.
 My question is this: is it normal for those sent items to show up in his "sent items" folder in exchange also? This happens even if his pc is shut down.
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Kash
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Will do, thanks.
After all passwords changed, user still getting many underliverable emails.
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The issue finally went away after changing the password. The only thing that I still cant figure out is why some of the outgoing emails were in the sent items folder. I scanned the pc with several pieces of software and none found any malware/viruses. Anyway, all is well now and thanks for the assistance.