I would say Tuta or Runbox or Posteo, but the truth is that any paid account that is not Google or Microsoft is way better than anything so as not to be profiled too much with their trackers and privacy-invasive practices.
On the technical side, no email is ever safe from being read either by the sending server or the receiving one. Email hasn’t changed for the past 50 years.
My Mullvad account begs to differ. And it makes my banker happy!