Tutanota is a freemium email encryption tool.
To filter spam messages, there are two plugins.You can integrate the Seahorse tool for key management and cryptographic features.You can use POP, IMP protocols, and SMTP for email transmission.Evolution uses GnuPGP protocol for email encryption with automatic sign and keys. Because it has a calendar, address book, and task manager functionality. You can use it as a personal management application also. Though it looks similar to Outlook, but it has lots of features. It supports Autocrypt, which allows automatic key discovery and exchange.Įvolution is one of the best email encryption tools for Linux.GNU Privacy Guard allows Enigmail for cryptographic functionality.Postbox and Interlink Mail & News both have extensions to use Enigmail.Enigmail has a graphical user interface for customization and better management.Similarly, the receiver can easily decrypt your message if he has this extension too. Enigmail encrypts your email according to OpenPGP protocol and sends it to the receiver. Because it is a Thunderbirds extension, but it requires both Thunderbird and GnuPG for proper functioning. Those who use Thunderbird email client are also familiar with Enigmail.
According to user ratings, Enigmail is one of the most useful email encryption tools.