That's why you use public key cryptography, for example with a Precursor. Problem with ProtonMail is its JavaScript. If we want to use e-mail with public key c

That's why you use public key cryptography, for example with a Precursor. Problem with ProtonMail is its JavaScript. If we want to use e-mail with public key cryptography (perhaps we shouldn't), we need to use standards which work in any MUA, and are completely FOSS. I believe we are better off with a protocol which has a FOSS reference spec, is federated, and from the ground up build with privacy and security in mind.