I have looked through many posts and see that others have had this problem, I can receive but not send email.  I have tried many of the suggestions from this site and others but no luck.  Here is the full text of the error message:

An unknown error has occurred.

Subject 'test'
Server Error: 421
Server Response: 421 
Server: 'smtp.comcast.net'
Windows Live Mail Error ID: 0x800CCC67
Protocol: SMTP
Port: 25
Secure(SSL): Yes


Depending on the suggestion I was trying, the last line sometimes changed to Secure(SSL): No
Does this make sense to anyone out there?

Thank you.

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