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.x in order to use the most recent versions of Enigmail. GnuPG 2.2.x is recommended for general use. GnuPG versions 2.0.x are end of life by December 31, 2017. The 2.0.x versions are still supported, but no longer recommended. Support will be dropped in medium term.

Main Features

  • Encrypt/sign mail when sending, decrypt/authenticate received mail

  • Support for inline-PGP (RFC 4880) and PGP/MIME (RFC 3156)

  • 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.