Thank you InlandAZ, I am really the only user of the computer that has the Windows Mail I would like to block. Occasionally other people can have a access to it and I want to avoid them checking the emails.
I can try one of the programs mentioned above. I don't really need something very secure.
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If real is what you can feel, smell, taste and see, then 'real' is simply electrical signals interpreted by your brain
From The Matrix