Me ha llegado por ahí:
- Riseup: https://riseup.net/es/email
- Autistici: https://www.autistici.org/services/mail
- Protonmail: https://protonmail.com/
- Lavabit: https://lavabit.com/want-lavabit.php
- FastMail: https://www.fastmail.com/
- Hushmail: https://www.hushmail.com/
- Tutanota: https://tutanota.com/es/
- Runbox: https://runbox.com/
FYI