Buttondown

Passkey support for two-factor authentication Use your fingerprint, face, or security key as a second factor when signing in.

We've added passkeys for 2FA!
You can now use your fingerprint, face, or security key as a second factor when signing into your account.
buttondown.com/blog/2026-03...

Hi there! We can help you out. What's your username?

How Buttondown's API versioning works A deep dive into our date-based API versioning system, inspired by Stripe, and how it lets us ship breaking changes without breaking your integrations.

A simple break down of how Buttondown's date-based API versioning system works, and how it lets us ship breaking changes without impacting your integrations.
buttondown.com/blog/api-ver...

Hi there! There isn't but there might be soon 👀

More newsletter settings in the API The /v1/newsletters endpoint now exposes locale, templates, socials, transactional emails, and more.

Now you can do more with the API!
We've added a big batch of new fields to the Newsletters API—more locale, templates, socials, transactional emails, and more.
buttondown.com/blog/2026-02...

How to send email to space The first email was sent from space three days after the first webpage was published.

The origin story of emails in space. 🚀
buttondown.com/blog/email-i...

How we enabled Content Security Policy for everyone Invisibly making your newsletter safer

How we've been making your newsletter safer from behind the scenes.
buttondown.com/blog/2026-03...

Sorry about that, we'll take a look! Thanks for reporting ~m

Recovery codes for two-factor authentication If you lose your authenticator device, recovery codes let you get back into your account.

We've added a helpful feature to 2FA—recovery codes. 🔐
Now, if you lose access to your authentication app, there's no need to panic because you have a backup option.
buttondown.com/blog/2026-03...

Custom email templates for everyone Full HTML control over your email design is now available to all Professional plan users.

New ship!🚀
If you're on a Professional plan or higher, you can now set up a custom email template directly from your email design settings.
buttondown.com/blog/2026-02...

Filter sent emails by engagement rate Quickly find your best (and worst) performing emails by filtering on open rate, click rate, and delivery rate.

Tracking email performance has gotten quicker and easier!
Instead of spending time scanning through your past emails, you can now filter your sent emails by open rate, click rate, and delivery rate with just a click.
buttondown.com/blog/2026-03...

How we check every link in your email The machinery behind Buttondown's link checker is more involved than you might expect.

How we save you from the dreaded Broken Link Embarrassment™️.
buttondown.com/blog/link-ch...

Buttondown Blog Buttondown's engineers, writers, and biggest fans write about the whole thing: engineering challenges, useful tips and tricks, new features, and more.

We've shipped exciting new features in February to make your life easier and newsletter smoother to manage! 💌
- Custom email templates
- Revamped replies
- Simplified cancelation
- OpenAPI specs for archives
+ more!

Check them out on our blog:
buttondown.com/blog

How Igor Ranc built Berlin's largest English-language tech newsletter Igor’s weekly newsletter informs Berlin’s expats of important tech business news, job opportunities, and professional resources in and around Berlin.

Igor’s weekly newsletter informs Berlin’s expats of important tech business news, job opportunities, and professional resources in and around Berlin.
buttondown.com/blog/igor-ranc

Should we bring back email exploders? Mailing lists died out to make way for newsletters. But there are a lot of reasons to bring back group discussions over email.

Should we keep group emails in the past or are they still useful?
buttondown.com/blog/email-e...

Inbox filtering Filter your inbox to show unread items or conversations needing a response.

Your notification inbox just got more useful. You can now filter to show only what needs your attention.
buttondown.com/blog/2026-01...

Your newsletter's archives are more valuable than your list Store, share, and protect your work so as many people as possible can see it.

There are multiple reasons why your newsletter's archives are valuable, or dare we say, priceless.
buttondown.com/blog/newslet...

Minimum viable complexity The art of adding complexity without making things complicated

The art of adding complexity without making things complicated.
buttondown.com/blog/how-to-...

Sort and filter by open and click rates Find your most (and least) engaged subscribers by sorting and filtering by open and click rates.

Exciting new ship!🚀
Now you can sort and filter your subscribers page by email open rate and link click rate, making it easier to find subscriber patterns and know who is engaging with your newsletter.
buttondown.com/blog/2026-02...

Better tag self-management Flip a toggle and subscribers can add or remove tags themselves in the portal.

We've improved upon a popular feature—self-managed tags!
Now subscribers can add or remove tags themselves in the portal with one click.
buttondown.com/blog/2026-01...

Custom click tracking domains Your click tracking links now use your own sending domain instead of a shared proxy.

New ship!🚀
We've now added the ability to use your own custom sending domain as the click tracking proxy instead of our shared one.
buttondown.com/blog/2026-02...

More newsletter settings in the API The /v1/newsletters endpoint now exposes locale, templates, socials, transactional emails, and more.

Now you can do more with the API!
We've added a big batch of new fields to the Newsletters API—more locale, templates, socials, transactional emails, and more.
buttondown.com/blog/2026-02...

Hi there, thanks for the catch! We'll fix this and add Tidal integration. :)💙

Ask A Nerd: How does newsletter cadence affect deliverability? The amount of time between emails can have a significant impact on how ESPs and subscribers view your writing.

Our nerd answers the pressing question: How does newsletter cadence affect deliverability? 🤔
buttondown.com/blog/cadence...

Revamped replies Reply tracking is now automatic for sending domains, and always on for everyone.

We've revamped replies!
Now, replies and reply tracking are more user-friendly and streamlined.
buttondown.com/blog/2026-02...

Forwarding an email is not always straightforward It’s rare for a good email to start with Fwd: Fw: fwd:

You know how to forward an email but do you reallllllly know how it works?
buttondown.com/blog/how-ema...

Custom email templates for everyone Full HTML control over your email design is now available to all Professional plan users.

New ship!🚀
If you're on a Professional plan or higher, you can now set up a custom email template directly from your email design settings.
buttondown.com/blog/2026-02...

How Rodrigo brings a humanistic view to consumer technology Jounalist, Rogrigo Ghedin, uses his bilingual newsletter to share his insights on the social and psychological impacts of modern consumer technology.

Incredible journalist, @manualdousuario.net, uses his bilingual newsletter, to share his insights on the social and psychological impacts of modern consumer technology. Read more about his work!
buttondown.com/blog/rodrigo...

Simplified cancellation No more choosing between "pause" and "cancel" — there's just one option now.

We've made the change you've been asking for: simplified cancellation!
Now you can easily cancel your billing when you want a break and reactivate them whenever you want to begin sending. The best part? You keep access to account features during the pause!💙
buttondown.com/blog/2026-02...

Ask a Nerd: Does email length affect deliverability? You’d have to send fairly lengthy newsletters to run into issues. And even then, only a subset of subscribers would suffer.

Our nerd answers the question: Does email length affect deliverability? 🤔
buttondown.com/blog/email-l...