# SparkPost: SMTP performance degradation in US cluster

- Impact (vendor’s label): none
- Status: resolved
- Started: 2023-12-18 04:30 UTC · Resolved: 2023-12-18 04:30 UTC · Duration: 0 min
- Updates: 1
- [Vendor status page: https://status.sparkpost.com/incidents/6lxyt1vx6v2z](https://status.sparkpost.com/incidents/6lxyt1vx6v2z)
- [Company: SparkPost](https://rewindex.com/company/sparkpost.md)

## Timeline of updates

- **resolved** 2023-12-18 04:30 UTC: We've identified a performance degradation between 5:25 to 7:40 UTC in our US cluster. Some customers using the SMTP protocol may have experienced slower deliveries during this period. This issue has been resolved.

_From the vendor’s published history: only the final update text is available for incidents before Rewindex began polling this page._


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Canonical: https://rewindex.com/company/sparkpost/incidents/6lxyt1vx6v2z · Markdown: https://rewindex.com/company/sparkpost/incidents/6lxyt1vx6v2z.md · JSON: https://rewindex.com/api/v1/companies/sparkpost/incidents/6lxyt1vx6v2z · Generated 2026-10-20T00:51:19.351Z