Enigmail is a data encryption and decryption extension for Mozilla Thunderbird and the SeaMonkey internet suite that provides OpenPGP public key e-mail encryption and signing. Developed by The Enigmail Project
License: Open Source
GPGMail is a macOS-specific plugin for Apple Mail that provides strong encryption and a user-friendly experience tailored for Apple users. In contrast, Enigmail is a cross-platform solution that integrates with Thunderbird, offering more flexibility and a broader range of encryption options, although it may be more complex to set up.