Basically fastmail is ok, but not really worth paying for. The interface isn't revolutionary, but does its job. If you're happy with gmail or whatever web-client you're currently using, you're not missing much.
Simple, minimal, FAST interface. I want it to just show my email and get out of the way. It is great at it. No fancy animations, no heavy UI actions, very FAST to use. I can happily use it even over a cellular connection without bloat.
Encryption like Protonmail - I wish Protonmail was the E2E encryption tool with convenience, but to me, it is NOT!
- I need to trust their promise not to deliver malicious web encryption code. What good is encryption if I need to trust them blindly?
- As a collateral for this not so great encryption, they can't index my emails - meaning I can't search my emails based on keywords. This regression makes it useless to me.
I pay for FastMail to host my personal email, and if they ever sell my data without my consent, I will look into legal action against them. It'd be a joke to think such a logic with Google.