Mailbox.org and Posteo.de are currently the best ranked privacy-focused email providers[1]. Both are based in Berlin, and are extremely low-profile. Mailbox.org supports custom domains, Posteo.de doesn't.

[1] https://dismail.de/serverlist.html

I use Gandi's email service because they offer you a mailbox when you buy a domain from them (and you use your domain of course). It is based in France (9 eyes).

I personally prefer tutanota