I use Fastmail - not too expensive, really good webmail client, has working shared calendar that isn’t OWA, and isn’t advertising scraping my e-mail. I would have liked a more private service, but back when I moved from self hosted to a service, that was about the best I could get that also had calendaring.

I tried Proton, even paid for a year. But hot damn the Android app is garbage. So I’ve moved to Fastmail and I like it a lot. The app is snappy and I love that it has calendar, contacts, mail, notes, and files storage all in the same app. I used a custom domain with Proton so wasn’t hard to switch to a different provider. Just wish I would’ve known how bad the mobile app was before I plunked down the money.

Is self hosting a valid answer?

I host my own email.

I’m oldschool.

I’ve had my own domains and mail servers for the past 3 decades and will maintain them for as long as I live.

And these days, all but the storage runs of Pi3, so it’s barely using any power either.

I use protonmail, simplelogin (for email aliases) and tutanota.

mailbox.org is quite good. I prefer them over protonmail because I want to use my own client. If you don’t care about using a web UI, use protonmail, otherwise use mailbox.org. you can also take a look at tutanota