I never really understood the point of that. If you are exchanging emails with someone using one of the most popular email services that together make 99% of the marketshare, their server retains your email unencrypted anyway. So the only time that encryption will really matter is when emailing someone who is also using Proton.

> the only time that encryption will really matter is when emailing someone who is also using Proton.

Correct, and this was/is explicit when you first sign up for a proton email account.

Proton also supports PGP emails... for the dozen or so people who are setup to receive them.