Unfortunately, you still need a level of trust with Proton. Even aside from trusting that they will not bend to pressure to terminate your service, you’re also trusting them with your network of contacts, because metadata (including the sender, recipient, and subject line) are not end-to-end encrypted in Proton.
Unfortunately, you still need a level of trust with Proton. Even aside from trusting that they will not bend to pressure to terminate your service, you’re also trusting them with your network of contacts, because metadata (including the sender, recipient, and subject line) are not end-to-end encrypted in Proton.
That’s fair, though that’s more of a flaw with the email protocol. There’s no way around leaking that to the receiver’s email provider as well.