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Mozilla Suite : FAQs : Enigmail

From MozillaZine Knowledge Base

How to add encryption and digital IDs in my mail?

Get EnigMail - Secure email communication based on OpenPGP encryption.

Enigmail is an extension to the mail client of Mozilla Suite/Netscape 7.x and Thunderbird which allows users to access the authentication and encryption features provided by the popular GnuPG software.

EnigMail Homepage