Outage in Mailgun
TLS Certificate Validation Errors for Clients Without SNI
Resolved MajorIncident Report
Summary AI Generated
Mailgun experienced a major incident where customers making HTTPS requests to the API without Server Name Indication (SNI) enabled received expired SSL/TLS certificates, causing certificate validation failures. The issue affected the API service and prevented these clients from successfully connecting to Mailgun's services. The problem was identified, fixed, and fully resolved after 1.9 hours of downtime.
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.
Components affected
Mailgun APITrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
RESOLVED
3 days ago - at 04/15/2026 03:34PM
This incident has been resolved.
MONITORING
4 days ago - at 04/15/2026 02:02PM
A fix has been implemented and we are monitoring the results.
IDENTIFIED
4 days ago - at 04/15/2026 01:42PM
The issue has been identified and a fix is being implemented.
INVESTIGATING
4 days ago - at 04/15/2026 01:40PM
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.
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