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be able to decrypt the letter we configure Thunderbird so if we're sending a letter to linux@linux.org we use Linus' public key. To do this we have to use the "Rules" for the letters.

Press OpenPGP/Edit Per-Recipient Rules/Add. The window opens where you have to specify email address to send the letter to. Check that all emails are being encrypted and signed. REMEMBER - here you specify the public key of the recipient.

DECRYPTING RECEIVED MAIL

So you've received encrypted mail! First thing to do is to get sender's public key! Open OpenPGP/Sender's Key/Import Public Key. Thunderbird will automatically find the right key and download it. Of course, if it has been uploaded to the keyserver. You have to look for the key only for the first time. Later it will be saved on your computer and the mail will be decrypted automatically.

If you trust the sender and you're 100% sure that the key belongs to the right person, check that in OpenPGP/Sender's Key/Set Key Trust.

SENDING MAIL

When you want to send encrypted email you just have to click OpenPGP/Sign Messgae and OpenPGP/Encrypt Message. After that just write and send your email. Before you'll be allowed to send it you'll have to enter the password which you specified when the key was generated. This is to avoid that somebody else sends a letter using your key.

Learn more about this author, Renars Silters.
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