Your email API returned 200. Did the message arrive?
Separate a successful send request from email arrival. Follow a tested failure reproduction and add correlated inbox assertions to your developer workflow.
Engineering
in the open.
Notes on email infrastructure, reliable tests and the decisions behind InboxSpec.
Looking for a how-to? Read the docsLatest articles
From the InboxSpec blog
How to test email without sending it to real customers
Route staging email to Capture SMTP, require TLS, and inspect synthetic messages. Includes a tested JavaScript example and checks for accidental delivery.
How to test email OTP flows without flaky polling
Test email OTP flows with isolated test inboxes, a bounded wait and explicit code validation. Includes TypeScript examples, timeout handling and cleanup.
