Using your own domain name is the most important as it allows you to change provider if they ever make a change you do not like or go bankrupt. In this regard, I think that the best is posteo or a smaller provider you know near your place (https://www.chatons.org/en).
This blog compare them all regarding privacy: https://digdeeper.neocities.org/articles/email
Using your own domain name is the most important as it allows you to change provider if they ever make a change you do not like or go bankrupt. In this regard, I think that the best is posteo or a smaller provider you know near your place (https://www.chatons.org/en).