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Most of the time that while making changes to settings the application restricts from the previously stored password.
When modifying or changing the configurations the application keeps prompting for the password.
It generally happens in case of Outlook and email applications and the same is applicable to Thunderbird emails.Most of the users often complain of password reset problem in Thunderbird.
So here is a correct and proper method to remove the stored password and reset new password in Thunderbird.Steps to Reset Thunderbird PasswordOpen the Thunderbird application Window users have to click on Tools and then select optionsMac users need to open Firefox and then click on preferencesClick on Security and then general tab Select the option 'Saved Passwords'The list of account will open, now select the account for which you want to change or reset passwordSelect 'Show Passwords' and then click on Remove Passwords on next WindowThe Thunderbird password will be removed.
Now close the application and open it againWhen Open again, Thunderbird will prompt for the password, Enter the passwordSelect the option 'Use Password Manager to Remember this password' and then click OKThe Thunderbird password will reset.
You can check to recover thunderbird password and resolve attachments error from here. Â