Enigmail is a free and open source security extension to Mozilla mail clients such as Thunderbird and SeaMonkey. It allows you to write and receive email messages digitally signed and/or encrypted with the OpenPGP standard, in a simple and easy way. To download Enigmail, please use the "Download" menu on top of this page.

The Enigmail Handbook is a 123-page comprehensive document integrating detailed installation and usage information, technical references, FAQs, troubleshooting, and general tips and tricks.

You can view the Handbook online (below), or download the original PDF:

The current edition is aimed at Enigmail version 1.9 but contains also guidance on previous versions.

 

 

Getting Started with Enigmail

What is Enigmail

Introduction to Cryptography, OpenPGP, and Enigmail

 

Setting up Enigmail

Installation of Enigmail

Quick start

 

Using Enigmail

Key Management

Signature and Encryption

Configuration

FAQ

Support

 

Additional Resources

Advanced Operations

Notes, Tips & Tricks