Sending the username and password has failed. Need help!

I was denied the opportunity to send messages. Received a notice: "the sending of username failed. Mail server mail.comcast.net answered the authentication has failed. What to do? I don't know what happened. I could send and receive yesterday. Please notify.

Post your troubleshooting information for your server settings can be examined.
Helps in the menu. Troubleshooting information. Clear the check box to include the account names. Then click on copy to the Clipboard. Come back here and paste in a window of response.

Tags: Thunderbird

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