# Mailgun: Critical incident: Delayed sending in EU

**Summary:** Mailgun reported critical delayed sending in the EU affecting API and Outbound Delivery services, starting 2026-05-25 12:18 UTC and resolved at 2026-05-25 15:55 UTC, with a reported duration of 3 h 36 min. A fix was implemented and monitored; no cause was stated. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2026-05-25 12:18 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/n5wrscxc3mtm](https://stspg.io/n5wrscxc3mtm)
- [Company: Mailgun](https://rewindex.com/company/mailgun.md)
- Versions: before (none: first archived) → after incident\_version:251/xdlnv85rl42x@9b1112b95f6c
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Delayed sending in EU
```

**2. Added: Impact**

```diff
+ critical
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-05-25 12:18 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-05-25 15:55 UTC
```

**6. Added: Affected components**

```diff
+ API, Email Services - API, Email Services - Outbound Delivery, Outbound Delivery
```

**7. Added: Update** (investigating) · 2026-05-25 12:18 UTC

```diff
+ We are currently investigating this issue.
```

**8. Added: Update** (investigating) · 2026-05-25 12:48 UTC

```diff
+ We are continuing to investigate this issue.
```

**9. Added: Update** (investigating) · 2026-05-25 12:59 UTC

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

**10. Added: Update** (monitoring) · 2026-05-25 13:00 UTC

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

**11. Added: Update** (investigating) · 2026-05-25 13:38 UTC

```diff
+ We are currently investigating this issue.
```

**12. Added: Update** (investigating) · 2026-05-25 14:10 UTC

```diff
+ We are continuing to investigate this issue.
```

**13. Added: Update** (identified) · 2026-05-25 14:46 UTC

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

**14. Added: Update** (identified) · 2026-05-25 15:35 UTC

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

**15. Added: Update** (monitoring) · 2026-05-25 15:45 UTC

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

**16. Added: Update** (resolved) · 2026-05-25 15:55 UTC

```diff
+ This incident has been resolved.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-05-25 12:18 UTC | Critical incident: Delayed sending in EU (this change) | degradation |

All Mailgun changes: [timeline](https://rewindex.com/company/mailgun/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


---
Canonical: https://rewindex.com/change/i7e26dc935bbca9 · Markdown: https://rewindex.com/change/i7e26dc935bbca9.md · JSON: https://rewindex.com/api/v1/changes/i7e26dc935bbca9 · Generated 2026-10-18T02:28:06.324Z