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copied!<p>Thunderbird with Enigmail is a great free solution for what you’d like to do. I use Outlook and PGP, but I think they’re approximately the same.</p> <p>For a detailed explanation of <a href="http://en.wikipedia.org/wiki/Public-key_cryptography" rel="noreferrer">public/private key encryption</a> check out the wiki page, but I’ll try to sum up here.</p> <p>To encrypt a message so that nobody else but the receiver (bob) can view it you encrypt the message using Bob’s public key. The public key allows you to encrypt but not to decrypt. Without a public key you cannot encrypt a message, so there is no worry about encrypting a message that nobody can decrypt.</p> <p>When Bob receives your message he will use his private key to decrypt the message. He keeps this private key very secret so that nobody else can decrypt his mail. To send an encrypted message back Bob will use _your public key (which you have sent him before) to encrypt a message. Then he will send it to you and you can decrypt it using your private key.</p> <p>That said the solution that I use for my mail is to use opportunistic encryption, so if I have the public key of any recipient of my mail message it gets automatically encrypted, if I do not, it doesn’t. This doesn’t protect me from accidentally sending out a secret message to a person that I don’t have a public key for however. For that I have to be very careful to always verify I have all the keys I need to have for secret messages.</p> <p>In order to do this I have an e-mail rule setup that says that if I have the word [PGP] in the subject line it will not allow the message to be sent unencrypted. If I try to it will throw an error and warn me of my mistake.</p> <p>The <a href="http://enigmail.mozdev.org/documentation/quickstart-ch1.php#id2532985" rel="noreferrer">enigmail</a> site has a good description on how to setup thunderbird to encrypt your messages.</p>

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