# SparkPost: Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2025-11-27 14:22 UTC · Resolved: 2025-11-27 15:24 UTC · Duration: 1.0 h
- Updates: 6 · Affected components: SMTP Delivery (Outbound Message Delivery) - SMTP Delivery - USA, SMTP Delivery - USA
- [Vendor status page: https://stspg.io/1jwgd1k0wphv](https://stspg.io/1jwgd1k0wphv)
- [Company: SparkPost](https://rewindex.com/company/sparkpost.md)

## Timeline of updates

- **investigating** 2025-11-27 14:22 UTC: We are investigating an increase in delivery latency for some outbound messages.  (NOTE: This does not impact our customers hosted in the EU.)
- **identified** 2025-11-27 14:22 UTC: The issue has been identified and a fix is being implemented.
- **monitoring** 2025-11-27 14:23 UTC: A fix has been implemented and we are monitoring the results.
- **monitoring** 2025-11-27 14:44 UTC: The MTA1 cluster is beginning to stabilize and we are seeing active recovery.  We will continue to monitor and provide updates as the cluster fully recovers.
- **monitoring** 2025-11-27 14:50 UTC: We continue to see significant recovery on the delayed messages.  Continuing to monitor and will post the next status after full recovery.
- **resolved** 2025-11-27 15:24 UTC: We have seen fully recovery from this delay event.  A postmortem will be posted shortly detailing the root cause and steps we have taken to prevent a reoccurrence.


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Canonical: https://rewindex.com/company/sparkpost/incidents/8tzm0ltv1q7y · Markdown: https://rewindex.com/company/sparkpost/incidents/8tzm0ltv1q7y.md · JSON: https://rewindex.com/api/v1/companies/sparkpost/incidents/8tzm0ltv1q7y · Generated 2026-10-19T21:09:10.456Z