Enigmail is an add-on to the email clients Postbox, SeaMonkey and Epyrus, allowing users to access the authentication and encryption features provided by GnuPG. Thus Enigmail enables Postbox and Interlink to send and receive digitally signed and/or encrypted messages using the OpenPGP standard.

In order to provide the crypto-features, Enigmail can use its own built-in library, or GnuPG. For GnuPG, the minimum version required is 2.0.14, 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.

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.


System Requirements


Windows 10 or 11


macOS 11 or newer


Any system that is supported by SeaMonkey or Epyrus


Quick Start

For a quick start guide, please see the Installation Manual.

Our Handbook is a complete reference manual, containing a quick start section.