Just this week I started looking into Gmail alternatives (as well as de-Googling myself as much as possible) and while I haven't pulled the trigger on anything yet, Fastmail is looking like the top contender at the moment.

Hey was on the table for a bit, but no matter how much I read about their alternative workflow, I just don't understand how it would be an improvement over my typical method of archiving emails as I get through them. My email is essentially just a to-do list. Once I've dealt with something, into the archive it goes, and I don't think about it again unless it shows up in a search result when I'm looking for something later.

I've just never had a problem with it so I don't see a need to reinvent the wheel and learn a new method of using email.