How do I fix this problem with a message stuck in my Windows Live Mail outbox?

Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity.

Subject 'draft Burning Daylight announcement and draft member list'
Server: 'mail.twc.com'
Windows Live Mail Error ID: 0x800CCC0F
Protocol: SMTP
Port: 587
Secure(SSL): No