Blog
Buttondown's engineers, writers, and biggest fans write about the whole thing: engineering challenges, useful tips and tricks, new features, and more.
- March 25, 2026Bookshop.org embeds
March 20, 2026Email was into agents before they were cool- March 19, 2026Passwordless login
- March 17, 2026Rename metadata keys in bulk
- March 16, 2026A spring cleaning for our legal docs
March 13, 2026Ask a nerd: what happens when you click the spam button?- March 9, 2026Passkey support for two-factor authentication
March 8, 2026How Buttondown's API versioning works- March 7, 2026Safer defaults for the email creation API
March 7, 2026How to send email to space- March 6, 2026How we enabled Content Security Policy for everyone
- March 5, 2026Recovery codes for two-factor authentication
March 3, 2026Filter sent emails by engagement rate- March 1, 2026How we migrated to TypeIDs without breaking clients
- February 28, 2026How we check every link in your email
February 27, 2026Use newsletter metadata in your emails
February 27, 2026Should we bring back email exploders?
February 23, 2026Sort and filter by open and click rates- February 21, 2026Custom click tracking domains
February 20, 2026More newsletter settings in the API- February 18, 2026Revamped replies
February 16, 2026Custom email templates for everyone- February 14, 2026Simplified cancellation
February 13, 2026Ask a Nerd: Does email length affect deliverability?
Buttondown is the last email platform you’ll switch to.