Split from this thread.

> Can receive emails but can't send them.

What happens when you try? Remove all unsent messages from the outbox (below the account folders in the folder pane), then compose a new test message with a unique subject and send it to yourself. When you see the error message, click on it to select it, then use right-click to copy it and paste it into your reply here.

The message could not be sent. The authentication setting might not be correct for your outgoing e-mail [SMTP] server. For help solving this problem, go to Help, search for "Troubleshoot Windows Live Mail", and read the "I'm having problems sending e-mail" section. If you need help determining the proper server settings, please contact your e-mail service provider.

The rejected e-mail address was *** Email address is removed for privacy ***'.

Subject 'song'
Server Error: 550
Server Response: 550 Please configure your mail client to use authentication.
Server: 'smtpauth.earthlink.net'
Windows Live Mail Error ID: 0x800CCC79
Protocol: SMTP
Port: 25
Secure(SSL): No