SMTP server keeps rejecting me with error Ox800ccc0F

I get an email, but can't send. SMTP.att.yahoo.com keeps rejecting me. Larry

In describing the problems with a mail client, always say what's this e-mail client and also indicate your version of Windows.  You have posted in the forum Feedback, which is posting comments on the web site of Microsoft Amswers, does not ask questions by e-mail.  I moved your post on the forum 'Making in network and get online' Windows.  Please return to your message, click on modify just below, change the Version of Windows, menu drop-down to choose your version of Windows and add some text in the body of the message telling us what email client you use.  Then click on submit.

The problem you describe is most often caused by failing to authenticate on the outgoing server.  In your e-mail client, view the properties of the account.  It should be a "Outgoing server" tab and in this tab should be a checkbox labeled something like "my outgoing (SMTP) server requires authentication."  This box must be checked for AT & T.

In addition, AT & T now uses the names of different server than what you said, and that, too, could contribute, even though AT & T said that the old server names should continue its work.  I've seen other posts describing problems with the old server names changing current corrected names for the server.  See this: http://www.att.com/esupport/article.jsp?cv=803&sid=KB401570&title=What+are+my+email+server+settings+(i.e.%2C+POP+and+SMTP)%3F#fbid=ejHRxOCJlnr )

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