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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 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
Subscriber preview
Justin Duke · 2025-11-17 · via Buttondown's blog

For most authors, previewing your email is casual—you might be checking some design details or tracing formatting issues first-hand. After a while, you've seen it all. But then there are the more nuanced cases: testing how your newsletter looks for different subscriber types, verifying paywall behavior, or making sure CTAs render correctly—which is why we added earlier this year the ability to view the paywall version of paid emails. Then there are the more esoteric cases where you want to test templating functionality or tags. Historically, the only way to do this was to actually send test emails to fake subscribers you've created, which match whatever state you're trying to test. This is time-consuming and cumbersome. Finally, though, we've got a better option.

You can now select any subscriber from your list directly in the preview panel. When you do, the email renders exactly as it would for that subscriber—using their metadata, subscription status, tags, and all the other personalization that makes your emails feel personal. No more creating fake test subscribers or sending yourself drafts just to see how {{ subscriber.metadata.first_name }} resolves for different people.

This works for both the email and web previews, and it's particularly useful for:

  • Testing personalization tags with real subscriber data
  • Verifying how premium content renders for different subscription types
  • Checking that conditional logic works correctly (like showing different content based on tags or metadata)
  • Seeing how your email looks for subscribers with different locales or custom metadata

The subscriber selector appears in the preview panel when you're editing an email. Just click the dropdown, search for a subscriber by email address, and select them. The preview updates instantly to show how that subscriber would see your email.

This replaces the old "free vs. premium" preview split—now you can preview as any subscriber, not just generic free or premium ones. Much more flexible, and way less work than the old approach.