what E-Mail provider do you use and why

https://feddit.de/post/4087044

what E-Mail provider do you use and why - Feddit

I’m currently still using gmail unfortunately Cock.li [http://Cock.li] (airmail.cc [http://airmail.cc])looks very nice but it is invite only

Tutanota. I used to use Proton, but unlike Tutanota they don’t encrypt folder names, which is a deal breaker. They’re privacy respecting, reputable, and overall a decent service.
Is that true? They don’t encrypt labels on proton?
Subject lines are also not encrypted, unlike Tutanota.
How would that work? Email doesn’t have a subject line encryption standard.
They implemented their own way of doing this. They don‘t use PGP. I don‘t know how it exactly works, but it‘s open source, so you can look at it yourself.
The problem is it doesn’t work unless everyone does it the same way. Pgp isn’t perfect but at least its a standard.