SBS 2003 - Exchange: email address hijack?

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All,

Currently running SBS 2003 R2. I have an high level user whose email
address may have been hijacked. This user is receiving thousand of emails
per hour. It appears that someone is sending out emails using my user's
email address and all the bounce backs are coming into his email box. It is
mostly from China and Russia.



Not being an expert in Exchange Server, is there a way to determine if
the emails are a) being sent out from our server to begin with, or b) are
they sent from another location and we are receiving the Undeliverable
notices?



All the emails (thousands of them) are address as System Administrator
(Undeliverable) or Mail Delivery Subsystem (Could not send message.)



Not sure how to handle this problem. Also, I hope this is the proper forum
since it exists on a SBS server. If not, let me know which forum would be
more appropriate.



Thank you,



Thomas J. Kroljic


.

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