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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
Analytics for sad stuff
Justin Duke · 2025-05-14 · via Buttondown's blog

Hey folks! We just added two new charts to help you keep an eye on your email deliverability: Permanent Failure Rate and Complaint Rate.

These new metrics give you visibility into potential delivery issues with your emails. (Not the most exciting topic, but it's important!)

Permanent Failure Rate shows you what percentage of your emails are bouncing or failing to deliver, which could signal problems with your subscriber list or email content.

Complaint Rate tracks when subscribers mark your emails as spam. A spike here means you should take a closer look at your content and sending practices!

Both metrics are now available in your Analytics dashboard and can be used for sorting emails in your list view. This makes it easy to identify problem emails or track improvements over time.