@troed @Viss Let's put it this way: the acc owner is in the same situation as if they used Gmail for free (if they were smart authorities would even have a harder time connecting the person to IPs and other metadata). This is speculation, but I'd bet that the relevant comms is already collected from the users or the recipients devices/e-mail accounts too.
So what is exactly the value Proton provided here that the user paid for?