Enigmail
Enigmail adds OpenPGP message encryption and authentication to your email client. It features automatic encryption, decryption and integrated key management functionality. Enigmail requires GnuPG (www.gnupg.org) for the cryptographic functions. Note: GnuPG is not part of the installation.
Supported
versions: Thunderbird 1.5 - 1.5.0.* ALL
Notes / Comments: This version fixes a security bug. Please refer to http://bugzilla.mozdev.org/show_bug.cgi?id=9730 for more details
Categories: Privacy and Security

Enigmail:
