the message was not sent by mailbox owner, is it being used to send spam by someone else?

We have a 2003 enterprise server and a 2003 exchange server, both with latest sp's. Every once in a while one of the mailbox owners gets a message addressed from the administrator that their message did not reach some or all of the intended recipients.  The mailbox owner did not send the email and is wondering if his mail account is being used to send spam.
sergenetAsked:
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wfcraven12Commented:
This is usually spam from someone spoofing the Administrator address.  I've seen this a handful of times on our end.  it's just probably trying to see if it gets any kind of response to see if the address is vaild.  if it can verify the address does actually exist then it'll open up the user to an unsightly amount of spam email.  i woud have the user disregard the message.
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sergenetAuthor Commented:
Please close this question as it is being shown as open in my profile. Thanks.
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