The claims against Protonmail and Tutanota (possibly others, but the are the two I saw) are from a place of ignorance. Both are the way the re because they are

The claims against Protonmail and Tutanota (possibly others, but the are the two I saw) are from a place of ignorance. Both are the way the re because they are decrypted clientside. IMAP/SMTP needs a bridge or is inaccessible because of the needed decryption step.