For the past several days I’ve seen a new dialog box whenever I tap on a link in ProtonMail for iOS. It turns out that it’s a new ProtonMail anti-phishing feature.
Another security improvement is our new link confirmation modal, which is now enabled by default on all our apps. This anti-phishing feature helps you avoid opening a link by mistake or going to a different page than you intended.
Check It Out: New ProtonMail Anti-Phishing Feature Makes You Confirm