Thunderbird has no passwords, it can just remember them for you. You do have a password for your account on the email provider's server though.

To look up passwords Thunderbird has remembered: At the top right of the Thunderbird window, click the menu button > Options > Security > Passwords > Saved Passwords > Show Passwords

If the password you're looking for is not listed there, you'll have to check with your email provider for password recovery options.

Correct. I don't remember ever setting a password for login to Thunderbird however when I attempt to login this error message appears:

Sending of password for user rmc46@att.net did not succeed. Mail server inbound.att.net responded: Server error - Please try again later.

lost thunderbird login password

Sending of password for user <user>@att.net did not succeed.

How are these two related?

That is the message received when I attempt to login to Thunderbird. I composed an explanation with that reply but don't see it here? Thank you

perhaps you need to look a it this way. Thunderbird supplies a password you gave it to the ATT server to get your mail. That message is coming from ATT to tell you they are refusing to connect and get your mail. It is not a "Thunderbird login"

Most of the people that have been coming here in recent months with ATT as their provider have not created a mailkey to replace their password as required by ATT.

See https://www.att.com/support/article/email-support/KM1240308/

First you have to create the key on the ATT web site and then you have to change the password used in Thunderbird.

See https://support.mozilla.org/en-US/kb/password-manager-remember-delete-change-tb

I have no idea what some of these people are talking about, I'm just an old guy sitting in front of a screen that was set up for me years ago. I don't suppose there is a easy answer for this but if there is PLEASE let me know. Thanks