418357 Sorry, but this is misinformation. Proton uses only PGP to encrypt your messages at rest, there is no additional "standard encryption" other than the same volume encryption used by other mail services
Was aware of Proton using an encryption for the mailbox, I was aware of PGP being used for messaging between other Proton users but also did not know that the mailbox was encrypted with the same way, since Proton's website is mainly advertising and less technical details its hard for me to discern - big thanks for this, was not an intentional error by any means.
418357 In all cases, Proton or an attacker can at any time access various unencrypted data and metadata such as subject lines, sender, receiver and date headers, and attachment names. Only the message body and any attached files are encrypted.
As for the previous post 418357 (too long, wont quote) - sadly this just shows true but also sad examples that if you are using something tied to an online service, there will always be a chance you will be given up. When it comes to threat models where you are at risk of any service giving you in like this, IMO the best bet would just be to avoid everything capable of collecting identifiable information, or use something where your information wouldn't be at risk and with preparation to cover up if that service ever became hostile.
Same also can apply to app developers as for the case in the second paragraph of that post, one bad update or exploitation of the Proton app and you're toast...
As for the last parts of the last message, it's agreeable. I've constantly mentioned even in this thread that email is a completely flawed system. It would need to either be redone or replaced with something else entirely. For the most of us, these services are more or less just harm reductive alternatives rather than secure alternatives. I would still rather choose Proton over a standard Email provider and do so in about 95% of my emails. While it is condemnable it's also backed partially by the excuse of the terrible design Email is built onto. Business is business and their advertising is likely what made them successful and able to stay afloat in the first place.