Outlook Settings for SbcGlobal Account. SMTP: smtp.att.yahoo.com, Security SSL, Port 465. make sure that you simply even have within the Outgoing server tab, that 'My outgoing (SMTP) server requires authentication.' is checked, which 'Use a similar settings as my incoming mail server is tic'd.
The incoming mail server was changed from pop.att.yahoo.com to imap.mail.yahoo.com.
The outgoing mail server was changed from smtp.att.yahoo.com:dougom@sbcglobal.net to sbcglobal.net.
Port had changed from 995 to 993.