That server can't handle port 465. Try changing the incoming port to 110.
If no improvement, change to the AT&T/Yahoo settings given here:
http://www.att.com/esupport/article.jsp?sid=KB401738
Gary VanderMolen, Microsoft MVP (Mail)
"Patsy" wrote in message news:77E030CE-B95C-4D4C-BDA6-...
The connection to the server has failed. Subject '10 Golden Pine - amendment
to change closing date', Account: 'EMC', Server: 'mail.bellsouth.net',
Protocol: SMTP, Port: 465, Secure(SSL): No, Socket Error: 10060, Error
Number: 0x800CCC0E