prompted with a logon to the MX record when opening a message frmo a user

Dear Experts,

I have an issue that I can't figure out, it`s only happening with messages from one user.
It was happening before, but then issue went away, now it`s happening again.
When he sends an e-mail and I open a message whether it has or does not have the attachments I get a logon prompt to our MX Record Ex: MAIL.SERVER.COM
This also happens if I was to forward this message to somebody else. To make things worse it`s happening whether user sends an e-mail internally or externally....
We have Exchange 2003 Standard and user has Outlook 2003
Any help is greatly appreciated.
LVL 2
technomicAsked:
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technomicAuthor Commented:
I will reset the user`s password to see if this resolves the issue...
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shauncroucherCommented:
Has he got images in his email, email signature? This sort of behaviour might occur if the image is a link to your mail server. Fine for user when they authenticate and link the image, not fine when they try sending it to non-authenticated users.

Shaun
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technomicAuthor Commented:
he ha s a signature with a link to a company website, however it still acts up even for the internal users. User is out right now, i will reset his password when he is in the office and will also remove the signature....
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shauncroucherCommented:
Well, do users need to login to get to the where the image is stored on the company website? If not, then this will not be it. Just a thought. Worth trying to remove the signature anyway, I have seen all kinds of strange things with user signatures.
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technomicAuthor Commented:
I think it was the signature, I modified it, there were no pictures posted anywhere... It stopped happening thought.
Thank you for the help.
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