# SparkPost: Critical incident: Partial Outage and Delivery Issues in US-West-2 Region

**Summary:** _summary pending_
- Kind: Major incident · Label: critical (vendor)
- Changed: 2026-07-24 11:14 UTC · Detected: 2026-10-19 18:53 UTC
- [Source: https://stspg.io/qjrqrvq4s5mq](https://stspg.io/qjrqrvq4s5mq)
- [Company: SparkPost](https://rewindex.com/company/sparkpost.md)
- Versions: before (none: first archived) → after incident\_version:755/gz7xng93whxg@68f24a8d60c6
- Change 1 of 1 for this incident

Incident page (full timeline): [Partial Outage and Delivery Issues in US-West-2 Region](https://rewindex.com/company/sparkpost/incidents/gz7xng93whxg.md)
## What changed

**1. Added: Title**

```diff
+ Partial Outage and Delivery Issues in US-West-2 Region
```

**2. Added: Impact**

```diff
+ critical
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-07-24 11:14 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-07-24 18:44 UTC
```

**6. Added: Affected components**

```diff
+ SMTP API - SMTP API - USA, SMTP API - USA, SMTP Delivery (Outbound Message Delivery) - SMTP Delivery - USA, SMTP Delivery - USA, Transmissions API - Transmissions API - USA, Transmissions API - USA
```

**7. Added: Update** (investigating) · 2026-07-24 11:14 UTC

```diff
+ We are investigating delivery issues caused by an ongoing AWS US West 2 region outage. Customers may experience delays while we assess the impact to our service. We are actively monitoring the situation and will provide updates as more information becomes available.
```

**8. Added: Update** (identified) · 2026-07-24 11:53 UTC

```diff
+ Outbound email delivery is blocked for our US West region. We working with our vendor resolve the issue. We are continuing to accept emails and queue them internally. We will deliver the messages as soon as the issue is resolved.
```

**9. Added: Update** (monitoring) · 2026-07-24 12:08 UTC

```diff
+ We are starting to deliver mails in our US West region. We are working through the queued messages. We are continuing to monitor the issue and continuing to accept emails.
```

**10. Added: Update** (monitoring) · 2026-07-24 13:16 UTC

```diff
+ We are still working through the queued messages. We are continuing to monitor the issue and continuing to accept emails.
```

**11. Added: Update** (monitoring) · 2026-07-24 17:29 UTC

```diff
+ We have implemented additional tuning to handle the significant influx of mail due to the AWS network outage and we are seeing improvement in delivery rates We are seeing significant recovery and expect most mail to be fully delivered in the next 30-35 minutes.  Estimated time for full recovery is 80-90 minutes.  We are continuing to look for additional optimizations and monitor the issue.
```

**12. Added: Update** (resolved) · 2026-07-24 18:44 UTC

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

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-07-24 11:14 UTC | Critical incident: Partial Outage and Delivery Issues in US-West-2 Region (this change) | critical |

All SparkPost changes: [timeline](https://rewindex.com/company/sparkpost/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/i5743f8b60f1f1c · Markdown: https://rewindex.com/change/i5743f8b60f1f1c.md · JSON: https://rewindex.com/api/v1/changes/i5743f8b60f1f1c · Generated 2026-10-19T21:43:56.914Z