Mailgun reported this minor-impact incident on its official status page on Oct 8, 2025, 15:00 UTC. It has since been resolved.
Right now Mailgun is operational. Live Mailgun status →
Between 12:55 UTC and 13:07 UTC, customers may have experienced email sending failures in the US region. A deployment of new code caused our sending pipeline to temporarily reject some email submissions with HTTP 500 or SMTP 451 errors (~ 2.5% of requests). Our team quickly identified the issue, rolled back the deployment, and restored normal service. Traffic was immediately shifted from the affected US region to the non impacted region to further mitigate customer impact while the rollback took place.
Our 5-minute checks didn't record a change in Mailgun's overall status around this incident. Smaller or regional incidents often leave a provider's overall status green.
Mailgun reported 10 incidents in the last 90 days, 5 of them major or critical. A typical incident lasted 1h 17m. See Mailgun's uptime and incident history