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Tightly integrated suport for OpenPGP with Mozilla Thunderbird and SeaMonkey (and other Mozilla-based mail clients)
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Encrypt/sign mail when sending, decrypt/authenticate received mail
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Per-Identity based encryption and signing defaults
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Per-Recipient rules for automated key selection, and enabling/disabling encryption and signing
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Integrated OpenPGP key management user interface
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Automatically encrypt or sign attachments for inline PGP messages
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Powerful GUI for easy configuration and OpenPGP key management
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Detailed user preferences for advanced configuration
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Integrated OpenPGP PhotoID viewer
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Supports OpenPGP key retrieval via proxy servers
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Integrates with GnuPG, version 2.2.x (recommended) and 2.0.x (old version, support ends 2017)
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Supports Mozilla's Multiple Identities feature
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Official release for all platforms supported by Thunderbird (Windows, Linux, Mac OS X, Solaris, *BSD)
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Many languages are included in the official releases