Follow the following information to set up an Yahoo!
Email: username@yahoo.com
Use server STMP: SI
Server SMTP: smtp.mail.yahoo.com
Port: 587
Crypt Connection: TLS
Authentication server requires: SI
Username: username@yahoo.com
Password: yourpassword
Email: username@yahoo.com
Server POP3: pop.mail.yahoo.com
Port: 995
Username: username@yahoo.com
Password: yourpassword
Crypt Connection: SSL
Email: username@yahoo.com
Server POP3: pop.mail.yahoo.com
Port: 995
Username: username@yahoo.com
Password: yourpassword
Crypt Connection: SSL