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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
Filter subscribers by domain
Justin Duke · 2025-07-04 · via Buttondown's blog

demo.buttondown.com/subscribers

Hey folks!

We're excited to announce a new feature that makes managing your subscriber base even easier (albeit in very specific, niche circumstances): domain-based filtering.

This is particularly useful for (again, I get it, kind of niche) things like:

  • "I want to give everyone from Vercel a special discount or tag."
  • "Looks like all of my non-Gmail subscribers are gonna be more likely to be businesses, so I should probably send them a different email."
  • "I want to unsubscribe everyone from nbc.com because I'm about to move my talents to ABC."

As always, we want to make the subscribers dashboard (and the API backing it) as powerful and flexible as possible. Let us know if you have any feedback or ideas for other ways to make it more useful!