End-to-End-* is typically just a buzzword. Interpretation is different, depending on who you ask and what is the subject. Regarding end-to-end encryption, back

End-to-End-* is typically just a buzzword. Interpretation is different, depending on who you ask and what is the subject. Regarding end-to-end encryption, back in 1984, Saltzer et al. [1] argued that "functions placed at low levels of a system may be redundant or of little value". So, proper email encryption is best achieved at the client application level. If we had got that right, ProtonMail would probably be irrelevant. [1] https://web.mit.edu/Saltzer/www/publications/endtoend/endtoend.pdf https://web.mit.edu/Saltzer/www/publications/endtoend/endtoe...