Outlook 2003 will not send messages. Stuck in outbox,

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G

Gary-Colorado

When I try to send a message I get the following message:

" Sending reported error (0X00CCC78); Unable to send the message. Please verify the e-mail address in your account properties. The server responded: 550 5.1.0 Authentication required."

What do I do?

Thanks in Advance
 
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