Mailgun · Apps and SaaSApr 15, 2026, 13:40 UTC

TLS Certificate Validation Errors for Clients Without SNI

MajorNot disclosedUpdated 47d ago

Apr 15, 13:40 UTCApr 15, 15:34 UTC

Duration

1h 54m

Impact

Major

Root cause

Not disclosed

Mailgun, 90 days

9 incidents

Affected

APIEmail Services - API

Final update

This incident has been resolved.

Resolved · Apr 15, 15:34 UTC
This incident has been resolved.
Monitoring · Apr 15, 14:02 UTC
A fix has been implemented and we are monitoring the results.
Identified · Apr 15, 13:42 UTC
The issue has been identified and a fix is being implemented.
Investigating · Apr 15, 13:40 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.