How to secure your emails with GnuPG and Enigmail - dudu.dyn.2-h.org
Illustrated tutorial to guide your first steps in email encryption and signature, even if you are a complete beginner, thanks to the great Enigmail Mozilla extension; plus many explanations and links to go further
PPS is a specification for email programs to follow to exchange public keys and encrypt mail. There is no PPS ``program, though. Each email system may find its own way to impliment PPS, and may have different criteria for the user-interface
Excellent list of email-clients that support PGP/MIME. It includes additional information such as operating system, plugins and PGP/MIME advantages in general
WinPT (Windoze Privacy Tray) is a taskbar utility for doing data en- or decryption. This program is free software under the terms of the GNU GPL. For this WinPT uses the GNU Privacy Guard