# WorkOS: Major incident: Email delivery delays

**Summary:** WorkOS reported a major AuthKit email-delivery degradation affecting customers without custom domains due to an upstream provider issue. It started 2026-06-04 23:22 UTC and resolved 2026-06-05 00:49 UTC, lasting 1 h 26 min; the provider scaled up backlog processing, and all queued messages were sent. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2026-06-04 23:22 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/2lzgdfg3zq47](https://stspg.io/2lzgdfg3zq47)
- [Company: WorkOS](https://rewindex.com/company/workos.md)
- Versions: before (none: first archived) → after incident\_version:324/v7m6h2r7m41d@ae42f2f12a01
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Email delivery delays
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-06-04 23:22 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-06-05 00:49 UTC
```

**6. Added: Affected components**

```diff
+ AuthKit, Core Services - AuthKit
```

**7. Added: Update** (identified) · 2026-06-04 23:22 UTC

```diff
+ Email delivery for customers without custom domains is delayed due to an issue with our upstream service provider.
```

**8. Added: Update** (identified) · 2026-06-05 00:08 UTC

```diff
+ Our email provider is continuing to work through the backlog and has scaled up to speed up the process.
```

**9. Added: Update** (monitoring) · 2026-06-05 00:34 UTC

```diff
+ Email delivery has recovered. We're continuing to monitor.
```

**10. Added: Update** (resolved) · 2026-06-05 00:49 UTC

```diff
+ The backlog of messages have been sent and system performance has returned to its expected state. Sending delays occurred between 2:50pm – 5:18pm PT.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-06-04 23:22 UTC | Major incident: Email delivery delays (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._


---
Canonical: https://rewindex.com/change/i0cb279f7c3d62f · Markdown: https://rewindex.com/change/i0cb279f7c3d62f.md · JSON: https://rewindex.com/api/v1/changes/i0cb279f7c3d62f · Generated 2026-10-18T02:55:11.417Z