As most of you probably know, sending an email is kind of like mailing a postcard, anyone that knows how to read it can do so all along the way while it is in route to its destination. In fact it may be temporarily stored on various servers all along the route. I just gave myself the ability to send and receive encrypted emails using my Thunderbird email application, which I have used for years and love! If you want to set up your own system and in effect put your email in a security envelope, then here is a link with the "How To" instructions. Both the sender and the receiver must have OpenPGP installed for it too work, so if you install the program and add on, then let me know so that I can get your public key and try it out.
How to encrypt your email