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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 Programmatic webhooks Email page views Tag statistics Discord webhook formatting Automatic subscriber cleanup RSS subscriber count Weekly subscriber reports More list columns Customizable list views How Max Voltar turned a side gig into a trusted keyboard resource How Nick Disabato runs two newsletters from one design consultancy Made-for-you share images Automation improvements End-of-email surveys Filter by date Survey-triggered automations More automation functionality New webhooks How France Insider built a news service with paid subscribers Email as primary key How John Willshire unites two businesses in one newsletter Confirmation reminders Email churned subscribers Email-to-draft Subscriber metadata columns ChatGPT integration Faster web archives Referral program Better search results TikTok embeds Subscriber timeline Spotify embeds Improved RSS-to-email Subscribe page OG image New analytics page Google Tag Manager Even more subscriber types Integrating Duda with Buttondown Linktree integration guide Advanced and enterprise plans Framer integration guide API requests page Team collaboration In-email surveys Better CSS settings Better RSS automation fetching! Editor toolbar improvements Smart filters Faster emails page RSS automations Faster email analytics Zapier error codes Image accessibility checks Tags vs newsletters OG image picker Image editor improvements API bulk actions Improved OpenAPI spec Mastodon support Better subscriber filtering Better subscriber validation Hotkey support! Programmatic access to analytics Stronger bulk actions Faster archive page Custom canonical URLs Email slug and metadata Improved writing interface Generating a Typescript router in Django Filter emails by source
Passkey support for two-factor authentication
Mary · 2026-03-09 · via Buttondown's blog

If you've set up two-factor authentication on your account, you now have another option for verifying your sign-in: passkeys. Instead of typing in a code from an authenticator app, you can use your device's fingerprint sensor, face recognition, or a hardware security key.

Head to Settings → Sign in & security and click "Add another way to sign in or verify." You'll see a new Passkey option alongside the existing authenticator app setup. Give it a name (like "MacBook Touch ID" or "YubiKey"), and your browser will walk you through the rest.

Once registered, your passkeys show up right next to your authenticator devices on the security page. You can rename or delete them anytime. At sign-in, after entering your password, you'll be prompted to verify with your passkey.

A few things worth noting:

  • You can register up to 10 passkeys, so you can cover multiple devices and keep a backup key in a drawer somewhere.
  • Passkeys work alongside authenticator apps. If you have both set up, you can choose which method to use at login.
  • Recovery codes still work as a fallback. If you lose access to both your authenticator app and your passkeys, recovery codes will get you back in.