Major incident

mailgun: TLS Certificate Validation Errors for Clients Without SNI

Affected: API

Current status of mailgun: Operational — live mailgun status

Timeline

1. Apr 15, 2026, 13:40 UTC
   investigating
   We are currently investigating an issue where customers making HTTPS requests to our API without Server Name Indication (SNI) enabled are being presented with an expired SSL/TLS certificate. This results in certificate validation failures for affected clients.
2. Apr 15, 2026, 13:42 UTC
   identified
   The issue has been identified and a fix is being implemented.
3. Apr 15, 2026, 14:02 UTC
   monitoring
   A fix has been implemented and we are monitoring the results.
4. Apr 15, 2026, 15:34 UTC
   resolved
   This incident has been resolved.

Updates as published by mailgun (original).