It’s not encrypted. You can’t compare that to Proton or Tuta.

I didn’t compare it to them. Besides, what good are they when no one I’m communicating with uses encryption? Unless you actually have people who are willing to use the same provider you do, or do the PGP thing to encrypt/decrypt it themselves, Proton and Tuta are no better than any others in that regard.

I’ll add another rec for posteo.de, I’ve used it for about a year and been very happy with it.