ProtonMail v3.16 adds elliptic curve cryptography, undo move, and a new anti-phishing feature. Learn more: https://protonmail.com/blog/protonmail-v3-16-release-notes/
Regarding the phishing safeguard, I agree that it would make people safer, but wouldn't it also make them click links more often because they rely on the prompt? If they have multiple email accounts they work with, they might become more vulnerable on their non-proton client.
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