I'm currently on Tuta, because I can't imagine Mail without a free tier. It's run out of Germany(EU). Its 3β¬ a month for the normal tier, free takes away most features. Like Proton, you need to use their (OSS)-Client, for encryption reasons. It's currently growing and I hope they don't go crazy anytime soon.
I was looking at Posteo, but I don't want my entire internet identity to be gone, if I ever can't pay for it.