The problem is that Proton Mail can’t fully fix it. Their E2E encryption requires active participation of both the sender and the receiver: https://proton.me/support/password-protected-emails
That means:
- No communication initiated by the other party is going to use it. Your bank account password recovery link isn’t E2E encrypted.
- If you want to keep a conversation you started with a human encrypted, the recipient has to use a clunky web portal to read & reply.
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