Mailgun outage, March 2025: Errors connecting to smtp.eu.mailgun.org

Mailgun reported and resolved an incident: Errors connecting to smtp.eu.mailgun.org. It lasted 10.4 hours.

Resolved

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

What happened

Started
Resolved
Duration
10.4 hours
Impact
major
Affected
API, SMTP, Outbound Delivery, Inbound email processing
  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 18 Mar 2025, 6:44 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

    We are continuing to investigate this issue.

  4. identified

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

  5. identified

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

  6. monitoring

    A mitigation has been put in place and SMTP / Inbound email processing in our EU region is back to full working behavior.

  7. monitoring

    We are continuing to monitor for any further issues.

  8. resolved

    This incident has been resolved.

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

  • Retry anything that failed during the 10.4 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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