Enigmail is an add-on to the mail client of Mozilla Thunderbird and SeaMonkey allowing users to access the authentication and encryption features provided by GnuPG. Thus Enigmail enables Mozilla Thunderbird and SeaMonkey to send and receive digitally signed and/or encrypted messages using the OpenPGP standard.
In order to provide the crypto-features, Enigmail requires GnuPG to be installed. Minimum version required is 2.0.9, but we recommend the latest versions of GnuPG as they contain the latest security fixes. If your operating system does not supply GnuPG by itself, you may download GnuPG for Windows or other systems.
If you still use GnuPG 1.4.x, you will have to migrate from GnuPG 1.4.x to GnuPG 2.0 in order to use the most recent version of Enigmail. GnuPG 2.0.x is recommended for general use; 2.1.x is supported, but currently only recommended for expert users.
Encrypt/sign mail when sending, decrypt/authenticate received mail
Per-Account based encryption and signing defaults
Per-Recipient rules for automated key selection, and enabling/disabling encryption and signing
OpenPGP key management interface
Please see the Features page for a full list of Enigmail's features.
For a quick start guide, please see the Installation Manual.
Our Handbook is a complete reference manual, containing a quick start section.