Using win 7 & win Live Mail, I can receive e-mail but unable to send.

Receive the following from my ISP, shaw.ca;

The SMTP server returned an error.

Subject 'test 16/4'

Server Response: +OK POP3 ready

Server: 'mail.shaw.ca'

Windows Live Mail Error ID: 0x800CCC60

Protocol: SMTP

Port: 110

Secure(SSL): No

Have spent hours with the ISP & they say everything at their end works. I am able to use their webmail without problems. Settings have been entered many times & the ISP confirms they are correct. Have attempted to repair windows essentials. Everything was working normally for months prior to this problem.