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Blog
Buttondown's engineers, writers, and biggest fans write about the whole thing: engineering challenges, useful tips and tricks, new features, and more.
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Better undeliverable heuristic
Justin Duke
September 26, 2025
A better heuristic for undeliverable subscribers
Firewall controls
Justin Duke
September 17, 2025
Better control over the firewall
Suppressed emails
Justin Duke
September 4, 2025
New status and notifications when emails are blocked due to content auditing.
Cleaner subscriber management
Justin Duke
July 28, 2025
Consolidated problematic subscriber types into a single "undeliverable" status with clear reasons.
Featured emails
Justin Duke
June 9, 2025
Pin your best emails to appear at the top of your archive page.
Test mode
Justin Duke
June 3, 2025
Route all outbound emails to your account for safe integration testing.
Analytics for sad stuff
Justin Duke
May 14, 2025
New charts for tracking permanent failure rates and spam complaint rates.
Configurable Firewall
Justin Duke
April 21, 2025
New spam blocking controls with adjustable thresholds and manual review options.
Suspicious activity detection
Justin Duke
April 18, 2025
Quickly spot suspicious domains or IPs
Undeliverable handling
Justin Duke
March 25, 2025
Better handling for undeliverable subscribers
API idempotency keys
Matias Artopoulos Kozak
October 24, 2024
Idempotency keys in the API
Dashboard customization
Justin Duke
July 8, 2024
More ways to customize your email dashboard
Comments dashboard
Justin Duke
April 3, 2024
New author tools let you sort and filter comments by subscriber, email, or date.
Better email delivery reporting
Justin Duke
September 8, 2022
Drill into the deliveries list to see who received each email.
Buttondown Blog