I have a new Optimus V and can receive email from my AY&T account but cannot send. Attempts fail with the error message "553 From address not verifed...". Forums for other phones have fixes for the problem, but they have not worked for me. Here are my settings for K-9 which I use for email:
INCOMING MAIL:
User name: myname@sbcglobal.net
Password: my_sbcglobal.net_password
POP3 server: pop.att.yahoo.com
Security type: SSL
Authentication type: PLAIN
Port: 995
OUTGOING MAIL:
SMTP Server: smtp.att.yahoo.com
Security type: SSL
Port: 465
(X) Require Sign-in
Authentication type: AUTOMATIC
User name: myusername@sbcglobal.net
Password: my_sbcglobal.net_password
INCOMING MAIL:
User name: myname@sbcglobal.net
Password: my_sbcglobal.net_password
POP3 server: pop.att.yahoo.com
Security type: SSL
Authentication type: PLAIN
Port: 995
OUTGOING MAIL:
SMTP Server: smtp.att.yahoo.com
Security type: SSL
Port: 465
(X) Require Sign-in
Authentication type: AUTOMATIC
User name: myusername@sbcglobal.net
Password: my_sbcglobal.net_password