I am personally using an often not mentioned solution.

I use Gandi.net as registrar for my domain name and they provide email hosting[1], CalDav and CardDav with it. They even have a web interface (using SoGo[2]).

So all my emails, contacts and calendars are properly managed[3] by a French company.

[1] https://www.gandi.net/en/domain/email

[2] https://sogo.nu/

[3] https://www.gandi.net/en/no-bullshit