So, your email password changed, but Thunderbird still has the old one saved and is pitching a fit because the password isn’t correct. You just need to change the password that is saved. Actually, technically, you’re going to delete the old password and save a new one. Here’s how:
- Open Thunderbird and go to
- Mac: Thunderbird > Preferences
- Windows: Tools > Options
- Click on the Privacy tab, then the Passwords sub-tab
- Click the button that’s labeled “View Saved Passwords”
- Find the account that has the bad password
- Click on it, then click the “Remove” button. This will delete that entry in the Password Manager
- Close Thunderbird and reopen it
- Type in the correct password and check the “Use Password Manager to remember this password.” checkbox