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Thank you! That is solved my problem. 
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When the user composes the new message in outlook 2003, in the FROM field, he wants to use another user's email address or the email address alias to him. So the recipient will only see the other user's email address. &nbsp;Currently the system doesn't allow me to do this. <br />
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Thanks.
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When the user composes the new message in outlook 2003, in the FROM field, he wants to use another user's email address or the email address alias to him. So the recipient will only see the other user's email address.  Currently the system doesn't allow me to do this. 

Thanks.

How to grant send as permisstion to allow one user to send emails from outlook using another user's email address.

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.