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Thank you for the correction.
Sender and recipient can’t be encrypted e2e. How would the server know to whom deliver the email if those are encrypted and not visible to it?
“End-to-end” is a bit of a misnomer in this case. Both Proton and Tuta apply encryption after receiving email in the general case, since email is not sent with E2EE across different providers (in general). Both Proton and Tuta can see your incoming email (body and all) from external servers in the general case — they just don’t store it that way. (This is different when sending email between two Proton users or two Tuta users.)
Defaults matter. Every time you open a private browsing window, that’s what you’re going to get. Every time you use LibreWolf or Firefox Focus or any other browser that disables/clears cookies by default (which is a good practice), that’s what you’re going to get.
I don’t want anything I search for going into OpenAI. Ever. I’d feel fine about this if they hosted their own models.