If you are getting a thunderbird authentication failure message while using a thunderbird email client. Proceed with the easy steps below to solve it.
Step 1:
If you have changed the password, the old password that is saved in the Mozilla Thunderbird email client needs to be removed.
Step 2:
Go to the main interface of the Mozilla Thunderbird email client, navigate to the Preferences window, and click the Security option at the top of the screen.
Step 3:
Select the Saved Passwords option.
Step 4:
This will remove the previously saved passwords in the Mozilla Thunderbird email client.
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