Exchange # 5.1.2 - destination e-mail system is unknown or invalid

I have an Exchange 2003 Server.  One of my users (only one that I can tell so far) has an issue sending mail to anyone else on the server.  She gets the following error:

"The message could not be delivered because the recipients destination email system is unknown or invalid.  Please check the address and try again, or contact your system administrator to verify connectivity to the email system of the recipient"

<WIMAD-EXCHANGE.wi.loc #5.1.2>


Have searched on the web but cannot find the same issue.  Can anyone help?  
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jzacherAsked:
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rhandelsConnect With a Mentor Commented:
Please post a comment in the Support area (in the top left) to close the question and ask for a refund of points..
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jzacherAuthor Commented:
Figured out answer myself- it was due to Outlook 2003 caching.  Have no idea why but turning it off worked.  
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jzacherAuthor Commented:
top left???
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rhandelsCommented:
Sorry, top right of the screen, you will see support there....
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jzacherAuthor Commented:
I know I must seem like an idiot, but I cannot find a way to e-mail anyone that handles the site.
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rhandelsCommented:
Hi,

You can get the question closed by posting a question within the support area. You can reach the support area by clicking on Support in the top right corner. Then, create a 0 points question that points to this question and ask to get this one deleted..
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