Posteo
Germany
German encrypted email provider with no ads, no tracking, and green hosting since 2009.
European Alternative to:

A small, principled email provider based in Berlin, founded in 2009 by Patrik and Sabrina Löhr. Posteo is one of those companies that hasn't really changed its pitch in fifteen years: one flat price, no ads, green power, and a hard line on customer data.
What you get
- A mailbox for €1 per month, with 2 GB included and the option to scale up
- IMAP/POP/SMTP plus a clean webmail interface, calendar and address book
- Support for OpenPGP and S/MIME, plus inbound TLS enforcement
- Anonymous payment options, including cash by post
How it operates
Posteo is fully cooperative-style: a small team, no investors, profits reinvested. Servers run on 100% renewable electricity, with Greenpeace Energy as the supplier. The company is known for fighting data requests in German court when it considers them overreach, and publishes annual transparency reports.
Honestly
It's small, the interface is functional rather than slick, and there's no big consumer brand around it. That's also why it's been doing the same job for a decade and a half without selling out or going under. If you want a no-nonsense German mailbox run by people who take privacy seriously, Posteo is hard to beat.