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How do I protect a mailbox with a password

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I would like to create a local folder, then make it accessible with the Master Password function, but the instructions don't help.

I would like to create a local folder, then make it accessible with the Master Password function, but the instructions don't help.

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That is because the master password is to protect your saved passwords not your email. Password protecting your computer with your operating system is want you need to do.