Ask HN: What's an email provider you would entrust your business with?

Since self-hosting email is still not viable in 2022, I'm looking for a reliable and secure provider to entrust my business email with.

I'm currently using Gandi but they don't support hosting email for domains not registered with them, and that's becoming a limiting factor.

Protonmail is nice but the bridge encrypt/decrypt app looks too cumbersome, and I would like my email on all of my devices, natively.

WebDAV and similar tie-ins are optional.

Thanks!