Outlook is sending emails to unintended contacts

Hi all
Ok, weird one here.
We are running exchange 2003 with Outlook 2003 clients. Twice now I have had users tell me that they have sent an email to someone and that the email has also been sent to another of their contacts... but they did not add this recipient in to TO, CC or BCC field. It seems to have been randomly sent. When I look at the email in their SENT folder for sure, there is only the intended recipient listed and nothing else.

Any ideas as to what could be causing this?? Got me scratching my noggin! Thanks

Tracy
tracyprierNetwork AdministratorAsked:
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MightySWCommented:
I would think that it is spyware that is causing this.  Run Search and Destroy on their computers and be sure to do an office repair.
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brad4444Commented:
Are they doing a reply to all?

Reply all can reply to BCC'd contacts in the original message.


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MightySWCommented:
I'm curious now,

"Reply all can reply to BCC'd contacts in the original message."

How is this possible?  The message they receive (when replying) is ONLY to them and will NOT show the BCC'd recipients at all...

Is there some other way?
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tracyprierNetwork AdministratorAuthor Commented:
Not reply emails. They both were originating original emails with just one recipient listed
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brad4444Commented:
I have not actually tested the validity of my comments but have read about the possibility a number of times.  Google "reply all bcc"
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MightySWCommented:
hmm, thanks...
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