TLS Certificate Validation Errors for Clients Without SNI

Incident Report for mailgun

Resolved

This incident has been resolved.
Posted Apr 15, 2026 - 08:34 PDT

Monitoring

A fix has been implemented and we are monitoring the results.
Posted Apr 15, 2026 - 07:02 PDT

Identified

The issue has been identified and a fix is being implemented.
Posted Apr 15, 2026 - 06:42 PDT

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.
Posted Apr 15, 2026 - 06:40 PDT
This incident affected: Email Services (API).
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