My main email service provider is now Tutanota. Best in class! and here is the referral:

The world's most secure email service, easy to use, open-source and private by design. It's ad-free and powered by 100% renewable electricity.

If you sign up with my personal invite link, you will get an additional free month on any yearly subscription:

https://mail.tutanota.com/signup?ref=NFVTbzN0cUc

PS: You can also get a Free membership and upgrade later.