Rename metadata keys in bulk
We've published a new blog post: > "First name" and "first_name", together at last Read it here!
A spring cleaning for our legal docs
We've published a new blog post: > Updated DPA, privacy policy, sub-processor list, and cookie policy. Read it here!
Ask a nerd: what happens when you click the spam button?
We've published a new blog post: > Honestly, it’s more conceptually complicated than technically complex. Read it here!
Safer defaults for the email creation API
We've published a new blog post: > A new API version that defaults to draft instead of sending, with a one-time confirmation header for immediate sends. Read...
Passkey support for two-factor authentication
We've published a new blog post: > Use your fingerprint, face, or security key as a second factor when signing in. Read it here!
How Buttondown's API versioning works
We've published a new blog post: > A deep dive into our date-based API versioning system, inspired by Stripe, and how it lets us ship breaking changes...
How we enabled Content Security Policy for everyone
We've published a new blog post: > Invisibly making your newsletter safer Read it here!
New API changes for Buttondown
Every ID in Buttondown's API is a UUID (e.g., ) with no indication of what it represents. UUIDs are great for databases, but they're not human-friendly....
How we migrated to TypeIDs without breaking clients
We've published a new blog post: > Making every ID in our API self-describing, one endpoint at a time Read it here!
How to send email to space
We've published a new blog post: > The first email was sent from space three days after the first webpage was published. Read it here!
Recovery codes for two-factor authentication
We've published a new blog post: > If you lose your authenticator device, recovery codes let you get back into your account. Read it here!
Filter sent emails by engagement rate
We've published a new blog post: > Quickly find your best (and worst) performing emails by filtering on open rate, click rate, and delivery rate. Read it here!
Updates from February
Custom templates for all You can write a Buttondown email template from scratch You’re not writing a Buttondown. You’re writing your newsletter. It should be...
Use newsletter metadata in your emails
We've published a new blog post: > Your newsletter's metadata is now available in email templates, giving you global variables you can reference across every...
How we check every link in your email
We've published a new blog post: > The machinery behind Buttondown's link checker is more involved than you might expect. Read it here!
Should we bring back email exploders?
We've published a new blog post: > Mailing lists died out to make way for newsletters. But there are a lot of reasons to bring back group discussions over...
New API changes for Buttondown
Each action inside an automation now carries its own timing, paving the way for multi-step sequences in a single automation. Previously, timing was a top-...
New API changes for Buttondown
Subscribers now include engagement counts and rates in the /v1/subscribers response: delivered_count open_count clicked_count open_rate click_rate You can...
Sort and filter by open and click rates
We've published a new blog post: > Find your most (and least) engaged subscribers by sorting and filtering by open and click rates. Read it here!
Custom click tracking domains
We've published a new blog post: > Your click tracking links now use your own sending domain instead of a shared proxy. Read it here!
