Features List
Tightly integrated suport for OpenPGP with Mozilla Thunderbird and Mozilla Seamonkey (and other Mozilla-based mail clients)
Encrypt/sign mail when sending, decrypt/authenticate received mail
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
Supports OpenPGP key retrieval via proxy servers
Integrates with GnuPG, versions 1.4.x and 2.0.x
Supports Mozilla's Multiple Identities feature
Official release available for: Windows, Mac OS X, Linux x86-32 and x86-64 (all in one release file)
Contributed / distribution builds for other operating systems such as Linux, Solaris, *BSD and OS/2
Many Language Packs, (mostly) included in the official releases, and available separately for localisation of contributed builds
