The error message is following:

This message could not be sent because its size exceeded the server's limit. You can use the option, located in Tools | Accounts | Properties | Advanced, to break messages into smaller parts.

Subject 'Fw: Dear Subscriber'
Server Error: 552
Server Response: 552 5.2.0 sl3q1j0092dT6vs01l3qFD This message was undeliverable. This message has been found to be a potential spam message, and has therefore been blocked. Please visit http://ww2.cox.com/coxagainstspam for more information.
Server: 'smtp.west.cox.net'
Windows Live Mail Error ID: 0x800CCC6D
Protocol: SMTP
Port: 25
Secure(SSL): No