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Exchange 2010, email resent from another mailbox

I've been alerted to a problem, that's so weird I'm posting before I've begun troubleshooting.

An email was sent from one mailbox to external recipients, with several in house mailboxes copied on the msg via a distribution list.

The Email appears to have been re-sent 40 odd minutes later but from a different internal mailbox, I believe the user was offline at the time.

The two users do not have any shared mailbox privileges, no send on behalf or full mailbox access.

I'm going to track the msg via msg I'D but wanted to ask for any advice on how to troubleshoot This?

The company use an external smtp relay server, so I'll be able to track the messages through that system as well.

Thanks
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TopCat-007
Asked:
TopCat-007
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1 Solution
 
KimputerCommented:
I suspect the user who re-sent it might have some mailbox rule to re-send (or fwd) some stuff (including the cc: fields). Hopefully, the subject line has been changed (RE: or FWD:) so you can track it more easily.
If possible and the recipients don't need to know about each other, use BCC instead.
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TopCat-007Author Commented:
It turned out that a BlackBerry using Active Sync freaked out, I've still not figured out how it happened but resetting the Berry to factory and re-creating the email setup fixed the problems.

When the effected user sent emails from the berry, some emails appeared to originate from other internal mailboxes, the msgs were even shown in the other users Sent Items folders however the delivery reports showed the correct sender/reply address.  

This network has around 50 users all with Berries and hardly any shared mailbox access/permissions, everyone else is perfectly fine, so how this could happen I just do not know.

One of the strangest issues I've ever come across.
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TopCat-007Author Commented:
the subject field had been altered, which lead me to the solution or at least proving that it was actually caused by a Blackberry, rather than the server itself.
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