Give these setting a shot and post back with an update. Cheers!
Title - SBC Global
user - filled in
password - fillled in
Email - filled in
Mailbox Type - Pop3
Incoming Mail Server - inbound.att.net
Incoming Server Port - 995
Incoming TLS/SSL - SSL
Outgoing Mail Server - outbound.att.net
STP Port - 465
SMTP TLS/SSL - SSL
SMTP User - filled in
SMTP Password - filled in
Also, you may need to format your username as username@sbcglobal.net