# WorkOS: Major incident: Elevated errors during email delivery

**Summary:** WorkOS reported a major email-delivery degradation starting 2026-07-27 10:05 UTC and resolved at 2026-07-27 13:04 UTC, lasting 2 h 58 min. An initial mitigation did not fully resolve the elevated errors; WorkOS applied a refined mitigation and confirmed delivery rates had recovered. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2026-07-27 10:05 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/1qrm50d6r7w9](https://stspg.io/1qrm50d6r7w9)
- [Company: WorkOS](https://rewindex.com/company/workos.md)
- Versions: before (none: first archived) → after incident\_version:324/64wkfhb0xvnn@42f71420e123
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Elevated errors during email delivery
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-07-27 10:05 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-07-27 13:04 UTC
```

**6. Added: Update** (investigating) · 2026-07-27 10:05 UTC

```diff
+ We are investigating elevated errors during delivery of emails.
```

**7. Added: Update** (monitoring) · 2026-07-27 11:03 UTC

```diff
+ We have implemented a mitigation and are continuing to monitor.
```

**8. Added: Update** (investigating) · 2026-07-27 11:20 UTC

```diff
+ Our mitigation did not fully resolve the issue. We are continuing to investigate.
```

**9. Added: Update** (monitoring) · 2026-07-27 12:11 UTC

```diff
+ We have applied a refined mitigation and are continuing to monitor delivery rates.
```

**10. Added: Update** (resolved) · 2026-07-27 13:04 UTC

```diff
+ Delivery rates have recovered.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-07-27 10:05 UTC | Major incident: Elevated errors during email delivery (this change) | degradation |

All WorkOS changes: [timeline](https://rewindex.com/company/workos/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._


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Canonical: https://rewindex.com/change/i76e1b39d67e7e4 · Markdown: https://rewindex.com/change/i76e1b39d67e7e4.md · JSON: https://rewindex.com/api/v1/changes/i76e1b39d67e7e4 · Generated 2026-10-18T02:29:09.866Z