Tutanota, one of the world's most secure email services: easy to use, open-source and private by design. It's ad-free and powered by 100% renewable electricity.
Now, I would like to invite you to Tutanota as well! If you sign up with my personal invite link, you will get an additional free month on any yearly subscription:
PS: You can also just get a Free membership and then you can upgrade later if you would like to.