Split from this thread.

The message could not be sent. The setting for your outgoing email [SMTP] server might need to be configured. To find the server settings for *** Email address is removed for privacy ***', please contact your email service provider.

Subject 'test'
Server Error: 554
Server Response: 554 5.7.1 [R8] Authentication Failed, must login.
Server: 'smtp.centurylink.net'
Windows Live Mail Error ID: 0x800CCC79
Protocol: SMTP
Port: 587
Secure(SSL): No