Proton mail is encrypted on the server with your key and proton does not have access to it. If you lose your login credentials and have to reset then you lose your old email because that key is not getting recovered.
The email comes into their server unencrypted. They promise that they will encrypt it for you, though. Of course, you’re also relying on the sending server to keep the message secure as well.
Proton Mail’s end-to-end encryption and zero-access encryption ensure only you can see your emails. Not even Proton can view the content of your emails and attachments.
Proton mail is encrypted on the server with your key and proton does not have access to it. If you lose your login credentials and have to reset then you lose your old email because that key is not getting recovered.
The email comes into their server unencrypted. They promise that they will encrypt it for you, though. Of course, you’re also relying on the sending server to keep the message secure as well.