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Is there (or could be) and option to password protect a folder in a mailbox list in Thunderbird? One click, no encryption or additional programs.

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In your mailboxes you have folder trees. I would like to have a password protection for one of them, so when somebody clicks on the folder 'Accounts', it asks for a password to see the contents. No master passwords or passwords for the whole inboxes. I don't want to input a password 10 times a day when i open up TB. Just when i click on a specific folder that may have some emails inside, that should be protected from view. Just simple, one click add password, enter password, see contents. No encryption or additional auxiliary programs. Has somebody already done that or could do as a built in feature or and add-on? Thank you!

In your mailboxes you have folder trees. I would like to have a password protection for one of them, so when somebody clicks on the folder 'Accounts', it asks for a password to see the contents. No master passwords or passwords for the whole inboxes. I don't want to input a password 10 times a day when i open up TB. Just when i click on a specific folder that may have some emails inside, that should be protected from view. Just simple, one click add password, enter password, see contents. No encryption or additional auxiliary programs. Has somebody already done that or could do as a built in feature or and add-on? Thank you!

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Well, if you don't encrypt it, chances are the mail store files themselves will be readable in any text editor.

This add-on offers some password capability: https://nic-nac-project.org/~kaosmos/profilepassword-en.html

There is also a config editor setting that requests a password. See this: http://kb.mozillazine.org/Protecting_the_contents_of_the_profile_-_mail and specifically, "Note: You can password protect the contents of the message pane by setting mail.password_protect_local_cache to true using the configuration editor in conjunction with setting a master password in Thunderbird."

However, I believe that both of these work at an account level rather than on specific folders. And both offer trivial and weak protection.