• Tightly integrated support for OpenPGP Interlink Mail & News and Postbox. Mozilla Thunderbird was supported up to version 68.

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

  • Support for PGP/MIME (RFC 3156), and inline-PGP (for reading only)

  • Support for automatic key discovery and exchange via Autocrypt.

  • Per-Identity based encryption and signing defaults

  • Per-Recipient rules for automated key selection, and enabling/disabling encryption and signing

  • Integrated OpenPGP key management user interface

  • Automatically encrypt or sign attachments for inline PGP messages

  • Powerful GUI for easy configuration and OpenPGP key management

  • Detailed user preferences for advanced configuration

  • Integrated OpenPGP PhotoID viewer

  • Integrates with GnuPG, version 2.2.x (recommended) and 2.0.x (old version, support ended 2017)

  • Supports Mozilla's Multiple Identities feature

  • Official release for all platforms supported by the mail clients (Windows, Linux, Mac OS X, Solaris, *BSD)

  • Many languages are included in the official releases