Mailgun outage, September 2025: Sending errors in US
Mailgun reported and resolved an incident: Sending errors in US. It lasted 5.3 hours.
OKResolved
From Mailgun's official status page, in their words.
What happened
- Started
- Resolved
- Duration
- 5.3 hours
- Impact
- major
- Affected
- API
- Investigating
- Identified
- Monitoring
- Resolved
Why it happened
Mailgun has not given a cause in its updates. We never guess one.
How it was resolved
All systems are operating normally at this time. Our engineers continue to monitor our systems for any recurrence or new issues.
Timeline
Oldest first, from the first notice to the resolution. From Mailgun's official status page, in their words.
- investigating
We are currently investigating reports of sending errors in US regions.
- investigating
We are continuing to investigate this issue.
- investigating
We are continuing to investigate this issue.
- investigating
We are continuing to investigate this issue.
- monitoring
A fix has been implemented and we are monitoring the results.
- identified
We are continuing to work to stabilize things at this time. We have no ETA.
- identified
Error rates are normalizing as we continue to work to fix the issue.
- monitoring
A fix has been implemented and we are monitoring the results.
- monitoring
Systems have normalized, we are continuing to monitor for any issues.
- resolved
All systems are operating normally at this time. Our engineers continue to monitor our systems for any recurrence or new issues.
What this means for a business (and what to check now)
- Retry anything that failed during the 5.3 hours.
- 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
Hear about the next Mailgun incident as it starts
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