Mailgun outage, March 2026: Elevated 401 errors in US Region
Mailgun reported and resolved an incident: Elevated 401 errors in US Region. It lasted 10 minutes.
OKResolved
From Mailgun's official status page, in their words.
What happened
- Started
- Resolved
- Duration
- 10 minutes
- Impact
- major
- Affected
- API
- Investigating
- Identified
- Monitoringnot posted
- Resolved
Why it happened
Mailgun has not given a cause in its updates. We never guess one.
How it was resolved
Mailgun marked it resolved at 20 Mar 2026, 5:53 am without a written explanation of the fix.
Timeline
Oldest first, from the first notice to the resolution. From Mailgun's official status page, in their words.
- identified
Some requests may be incorrectly failing with 401 error codes in our US region.
- resolved
A fix has been deployed and systems are back to normal.
What this means for a business (and what to check now)
- Retry anything that failed during the 10 minutes.
- Enter any payments, bookings or jobs you took another way.
- If a deadline fell inside the window, keep this page as your record of the outage.
The full guide: what to do when a service you rely on is down
Other Mailgun incidents
- Route delays in EU Region, resolved after 1.1 hours
- Route delays in EU Region, resolved after 42 minutes
- Route delays in EU Region, resolved after 58 minutes
- EU Messaging Outage, resolved after 17 minutes
- Microsoft Incident Resulting in Delivery Issues to M365, resolved after 34 minutes
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