Mozilla enigmail
Using Mozilla to send encrypted mail using PGP or GPG
http://enigmail.mozdev.org/index.html
from
JoeUser Forums
Enigmail is an extension to the mail client of Mozilla / Netscape 7.x which allows users to access the authentication and encryption features provided by the popular GnuPG software.
Enigmail is open source and dually-licensed under the GNU General Public License and the Mozilla Public License.
Enigmail is open source and dually-licensed under the GNU General Public License and the Mozilla Public License.