You Cannot Send Email and Recevie Error Code 0x800CCC78 when using Microsoft Outlook and ATT-SBCGOBAL DSL

When trying to send email, you receive this error: Task 'email account name' - Sending' reported error (0x800CCC78) : 'Unable to send the message. Please verify the e-mail address in your account properties. The server responded: 553 From: address not verified; see http://help.yahoo.com/l/us/yahoo/mail/original/manage/sendfrom-07.html'
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