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Thunderbird does not connect to server

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My Thunderbird will con connect to server. I get fail msg. "error with user name". The I get msg."log on to .mail.comcast.net" failed.

It was ok till yesterday

WHAT DO I DO TO FIX!

My Thunderbird will con connect to server. I get fail msg. "error with user name". The I get msg."log on to .mail.comcast.net" failed. It was ok till yesterday WHAT DO I DO TO FIX!

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".mail.comcast.net" doesn't look to me like a valid email server address.

Could you post your settings so we can see what it is using?

Please add the troubleshooting information to your post. To find the Troubleshooting information:

  • Open Help (or click on three-line-icon and select Help);
  • Choose Troubleshooting Information;
  • Clear the check box Include account names;
  • Use the button Copy to clipboard to select all;
  • Paste this in your post.