Cannot send emails from Comcast account

All of a sudden I can't send e-mail from comcast account from my computer Dell. Is this a bug! I can send messages from the iphone, itouch and MAC very well. What the heck is this problem? I tried the port out 25 and 587. I've turned on auth and off... Nothing helps. When I try to send email I get this error below.

The message could not be sent. The authentication setting are may not be wrong for your e-mail [SMTP] Server outgoing. To resolve this issue, go to help, search for "Troubleshoot Windows Mail" and read the section "I have problems sending e-mail". If you need help to determine the appropriate server settings, contact your e-mail service provider.

The rejected e-mail address was 'DELETED EMAIL'. ' Subject 'test', account: 'mail.comcast.net', server: 'smtp.comcast.net', Protocol: SMTP, server response: ' 550 5.1.0 authentication required ', Port: 587, secure (SSL): no, Server error: 550, error number: 0x800CCC78

Here are the settings that work for my Comcast account in Windows Mail.  How they compare to yours?  Did you ensure that the e-mail address you specified on the general tab is valid?

Servers tab:

Information about the server
     
Incoming (POP3) mail: mail.comcast.net
Outgoing (SMTP) mail: smtp.comcast.net
     
Incoming mail server

Connect with secure password authentication: unchecked

Outgoing e-mail server

My server requires authentication: checked.  Parameters: Use the same settings as entering my mail server

Advanced tab:

The Server Port numbers

Outgoing (SMTP) mail: 587
This server requires a secure connection (SSL): unchecked

Tags: Windows

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