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Buttondown's blog

Email could have been X.400 times better The physicists who convinced Fermilab to send Brazil's emails Better in-app previews Analytics 3.0 Subscriber ID variables Comments! Send latest premium action Automation filtering Free API subscribers Surveys in automations Reply to replies Labels for RSS feeds How Jeremy Singer-Vine curates curious datasets for readers 2023 (and what's next) Email vs web content Sort by engagement Better gift subscriptions How Andy Dehnart built a career reviewing television New email template Email-based automations Opt-in reply tracking Automatic alt text More social network integrations Sort by metadata Overlarge image warnings Automation tag actions Pause emails mid-flight Search tags and automations Gift via automations Subscriber-driving emails
Passwordless login
Mary · 2026-03-19 · via Buttondown's blog

When we shipped passkey support last week, passkeys worked as a second factor — you'd still type your password first, then verify with your fingerprint or security key. That's great for security, but it's an extra step.

Now you can skip the password entirely. If you have a passkey registered on your account, you'll see a "Log in with a passkey" button right on the login page. Tap it, verify with your device, and you're in.

If you've already registered a passkey in Settings → Sign in & security, it just works — no need to set up anything new.