Mailgun outage, May 2026: Delayed sending in EU

Mailgun reported and resolved an incident: Delayed sending in EU. It lasted 3.6 hours.

Resolved

From Mailgun's official status page, in their words.

What happened

Started
Resolved
Duration
3.6 hours
Impact
critical
Affected
API, Outbound Delivery
  1. Investigating
  2. Identified
  3. Monitoring
  4. 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 26 May 2026, 1:55 am without a written explanation of the fix.

This incident on the Mailgun status page

Timeline

Oldest first, from the first notice to the resolution. From Mailgun's official status page, in their words.

  1. investigating

    We are currently investigating this issue.

  2. investigating

    We are continuing to investigate this issue.

  3. investigating

    A fix has been implemented and we are monitoring the results.

  4. monitoring

    A fix has been implemented and we are monitoring the results.

  5. investigating

    We are currently investigating this issue.

  6. investigating

    We are continuing to investigate this issue.

  7. identified

    The issue has been identified and a fix is being implemented.

  8. identified

    We are continuing to work on a fix for this issue.

  9. monitoring

    A fix has been implemented and we are monitoring the results.

  10. resolved

    This incident has been resolved.

What this means for a business (and what to check now)

  • Retry anything that failed during the 3.6 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

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