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
Enigmail is designed for use with Thunderbird and focuses on PGP encryption for email, providing a more robust set of features for desktop users. In contrast, Mailvelope is a browser extension that allows users to encrypt webmail, making it more versatile for those who prefer web-based email services.