For Windows users, the easiest way to use GPG encryption with email is to use the “clipboard” function in the GNU Privacy Assistant – Key Manager and copy and paste the content of your email.
Open GNU Privacy Assistant and click on “Clipboard”. Enter the message you wish to send:
Now, click on “Encrypt”. Choose the recipient you wish to send the message to and make sure to check the “Sign” checkbox:
Click “Ok”. If a box appears that says “Unknown key”, ignore it and click “Yes”. Enter the passphrase you created earlier and continue. You should now have the following:
Copy and paste the whole text into an email client and send the PGP encrypted message.