Outlook Web Access signon prompt when opening a message in Outlook 2003

We are having an odd situation.   We are running Exchange 2003 with Outlook 2003 clients.   When my users receive an email from one particular user, it is prompting them for an OWA logon and password.  Then can cancel past it and read and manipulate the message, but this happens with every message he sends.  The  user is question does access his email via OWA.     I am at a loss as to what is causing this.  Help!
RoseFletcherAsked:
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vasanthgnbCommented:
Is the user sending those e-mails having a signature with Images or active HTML content??

What happens if the user send a plain text message??

look at http://support.microsoft.com/kb/895948

Thanks,
Vasanth.
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RoseFletcherAuthor Commented:
I aplogize for the delay in response.  I was waiting for my user to get back to me.
The problem was indeed an embedded HTML code in his signature on OWA.    Once he removed it, the problem ceased.
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