GnuPG

GnuPG is a powerful tool to help you encrypt your data and your email. You can easily encrypt your email using an extension for your email client (like Enigmail for Thunderbird). GnuPG will help you increase the confidentiality of your communication using the most powerful encryption algorithm. Furthermore, since the interface is all CLI based, you can easily integrated gpg inside your CI system. So you can make sure that Jenkins or other build tools send encrypted emails.

It has all known and familiar features for encrypting, decrypting and managing keys. It´s the de-facto tool for all encryption needs

The command line interface. Simple and intuitive. It does encryption and signing using the OpenPGP standard.