Windows mail not sending or receiving....

[withers0705]

I had it working for about a week or so and now all of sudden the email
messages are staying in my comcast account and not coming through to my
windows mail. Also, I cannot send any emails out through Windows mail. I
get the error message.....Your server has unexpectedly terminated the
connection. Possible causes for this include server problems, network
problems, or a long period of inactivity. Subject 'hey', Account:
'mail.comcast.net', Server: 'smtp.comcast.net', Protocol: SMTP, Port: 25,
Secure(SSL): No, Error Number: 0x800CCC0F

What does this mean? How do I fix this?

 

[withers0705]

Also, I changed my port to 587 like I saw on previous posts but it's still
not working...getting same message...

 

[Gary VanderMolen]

In addition to changing the outgoing port to 587, you must also
enable the "My server requires authentication" option.

If that was already done, which antivirus are you running?
Some of them are not very compatible with Windows Mail.