Update: 2022: GPG is now integrated into Thunderbird 🙂 And it works pretty okay, thanks all involved 🙂 https://www.linuxbabe.com/security/encrypt-emails-gpg-thunderbird https://support.mozilla.org/en-US/kb/openpgp-thunderbird-howto-and-faq Update: 2021-01 Mozilla changed a lot in Thunderbird, Enigmail and other addons are not working anymore. Update: 2020-10 apt-listchanges: News … Continue reading GNU Debian Linux – howto Send encrypted E-Mail with Thunderbird and Enigmail and PGP in 5 Minutes (including backup and restore keypair) – your secret key has missing trust