PGP, or more specifically OpenPGP is a great, and more importantly FREE method of securing your data and your e-mails. You don’t want “The Man” reading your e-mails, and neither do I.
There are many PGP and OpenPGP programs out there, but the one that is the most versatile that I have seen is called GnuPG. It comes in some form for every operating system. It comes standard with Ubuntu Linux, and there are versions for Windows and MAC.
They make plugins for firefox and thunderbird <a href=”http://www.asktheadmin.com/2007/06/open-source-e-mail-encryption.html”>read the whole article on Email encryption here.</a>
And best of all it IS open source!!