Problem with emails going to another user

i have a problem and i would like to ask if anyone had the my company we have exchange 2007 .Someone has sent a confidential e-mail to one person and CC in other 3.The message has been delivered in 4 users and the same e-mail has been send to another user that has not been contained in the list.IS their a possibility that problem to be happend?

Can anyone helep me?

Thanks in Advance
Who is Participating?
MesthaConnect With a Mentor Commented:
Have you checked message tracking to see what happened? It could be that the other recipient was simply BCCd, which wouldn't show to the recipients.

Delegates is the other major cause.

Hendrik WieseInformation Security ManagerCommented:
make sure that the user that was not suppose to receive the message is not a deligate on one of the other users accounts
Hendrik WieseInformation Security ManagerCommented:
also make sure that none of the other users has got a forward on their mailboxes that roots to the user that was not suppose to receive it
Also check to make sure there are no (inbox) rules running that have a forward based on criteria in an email to that use
Check and make sure the user who received the email doesn't have an SMTP address setup on their AD profile that corresponds to one of the users it was sent to
salapatasAuthor Commented:
the user had delegate permissions..
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