Changes / Mailgun / Elevated 401 errors in US Region
Mailgun: Major incident: Elevated 401 errors in US Region
Summary
Mailgun reported a major incident affecting API and Email Services - API in the US region, where some requests incorrectly failed with 401 errors. It started at 2026-03-19 18:43 UTC and lasted 10 min, resolving at 2026-03-19 18:53 UTC after a fix was deployed and systems returned to normal.
Machine-written from the diff below (Sol; type: incident outage). Check the diff before relying on it.
What changed
Before: not present
After: Elevated 401 errors in US Region
Before: not present
After: major
Before: not present
After: resolved
Before: not present
After: 2026-03-19 18:43 UTC
Before: not present
After: 2026-03-19 18:53 UTC
Before: not present
After: API, Email Services - API
Before: not present
After: Some requests may be incorrectly failing with 401 error codes in our US region.
Before: not present
After: A fix has been deployed and systems are back to normal.
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History of this incident
| When (UTC) | Change | Kind |
|---|---|---|
| Major incident: Elevated 401 errors in US Region (this change) Mailgun reported a major incident affecting API and Email Services - API in the US region, where some requests incorrectly failed with 401 errors. It started at 2026-03-19 18:43 UTC and lasted 10 min, resolving at 2026-03-19 18:53 UTC after a fix was deployed and systems returned to normal. | Major incident |