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 an open-source encryption plugin for Thunderbird, offering robust security features but requiring technical setup and being limited to desktop use. In contrast, Tutanota is a user-friendly email service with built-in encryption, mobile app support, and additional features for businesses, but lacks the flexibility of open-source software.