Mailgun incident

TLS Certificate Validation Errors for Clients Without SNI

Major Resolved View vendor source →

Mailgun experienced a major incident on April 15, 2026 affecting API, lasting 1h 54m. The incident has been resolved; the full update timeline is below.

Started
Apr 15, 2026, 01:40 PM UTC
Resolved
Apr 15, 2026, 03:34 PM UTC
Duration
1h 54m
Detected by Pingoru
Apr 15, 2026, 01:40 PM UTC

Affected components

API

Update timeline

  1. investigating Apr 15, 2026, 01:40 PM UTC

    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. identified Apr 15, 2026, 01:42 PM UTC

    The issue has been identified and a fix is being implemented.

  3. monitoring Apr 15, 2026, 02:02 PM UTC

    A fix has been implemented and we are monitoring the results.

  4. resolved Apr 15, 2026, 03:34 PM UTC

    This incident has been resolved.