I also have Windows Live Mail (Windows 7) and my mail is also stuck in the outbox. This is the error message I receive:

 

Server Error: 554
Server Response: 554 omta02.westchester.pa.mail.comcast.net comcast Port 25 not allowed - http://customer.comcast.com/help-and-support/internet/email-client-programs-with-xfinity-email/
Server: 'smtp.comcast.net'
Windows Live Mail Error ID: 0x800CCC6F
Protocol: SMTP
Port: 25
Secure(SSL): No
 
What can I do?
 
Marcie

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