My e-mail client is Portable Thunderbird. There is an extension called Enigmail and it uses Gnu Privacy Guard (GPG) . The whole setup took less than 10 minutes on my laptop (WinXP SP2) and after a few trials, everyhing is working fine. I just quickly followed the instructions on the Enigmail site.
Here is a quick start (of course please check the instructors above for other details):
- Download GnuPG for Windows and install it
- Add the directory to your PATH in which gpg.exe resides (it is C:\Program Files\GNU\GnuPG in my system)
- Download Enigmail extension for Windows and import it into your Thunderbird thru Tools --> Extensions. Next time you start your Thunderbird you will see an OpenPGP menu on the top.
- From inside Thunderbird, generate a key pair for yourself from OpenPGP-->Key Management-->Generate-->New Key Pair
For Unix folks,
Come on... You know what to do ;-)
Here is my pgp public key.