Optus account is working fine, but yahoo account wont send... Any ideas on how to fix this would be greatly appreciated.

The connection to the server has failed.

Subject 'Fw: Your My Pet Universe Order Confirmation (#3950)'
Server: 'smtp.mail.yahoo.com'
Windows Live Mail Error ID: 0x800CCC0E
Protocol: SMTP
Port: 25
Secure(SSL): No
Socket Error: 10013