Tuta
What it's for
A German email service, fully open-source and free of any Google service.
Why it matters
It also encrypts the subject line and some metadata, with post-quantum-resistant encryption. EU jurisdiction.
For whom & when
Those who want maximum encrypted metadata and fully free software. It doesn’t use PGP: to write encrypted to outsiders, you password-protect the message.
Install & use
Create an account at tuta.com and install the app (available on F-Droid).
To write encrypted to a non-user: click the lock and set a password, shared with your correspondent through another channel.
- Turn on two-factor authentication.