# Mailgun: Major incident: Intermittent Email Validation Errors

**Summary:** Mailgun reported intermittent email validation errors with major impact affecting API and Email Validation components from 2026-02-25 19:10 UTC to 2026-02-25 21:45 UTC, lasting 2 h 35 min. A fix was implemented by 02-25 21:36 UTC, and the incident was resolved. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2026-02-25 19:10 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/zt8kjgf6jh9k](https://stspg.io/zt8kjgf6jh9k)
- [Company: Mailgun](https://rewindex.com/company/mailgun.md)
- Versions: before (none: first archived) → after incident\_version:251/z7vw4jqlm28h@41f56a567dd1
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Intermittent Email Validation Errors
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-02-25 19:10 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-02-25 21:45 UTC
```

**6. Added: Affected components**

```diff
+ API, Deliverability Services - Email Validation, Email Services - API, Email Validation
```

**7. Added: Update** (investigating) · 2026-02-25 19:10 UTC

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

**8. Added: Update** (investigating) · 2026-02-25 19:29 UTC

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

**9. Added: Update** (identified) · 2026-02-25 19:29 UTC

```diff
+ Domain verification is also impacted. Increased chances of domain verification failing.  The issue has been identified and engineering is actively working on a fix.
```

**10. Added: Update** (identified) · 2026-02-25 19:30 UTC

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

**11. Added: Update** (identified) · 2026-02-25 19:47 UTC

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

**12. Added: Update** (identified) · 2026-02-25 20:25 UTC

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

**13. Added: Update** (monitoring) · 2026-02-25 21:36 UTC

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

**14. Added: Update** (resolved) · 2026-02-25 21:45 UTC

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

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-02-25 19:10 UTC | Major incident: Intermittent Email Validation Errors (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/i682e20e541b66b · Markdown: https://rewindex.com/change/i682e20e541b66b.md · JSON: https://rewindex.com/api/v1/changes/i682e20e541b66b · Generated 2026-10-18T01:30:06.118Z