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

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2025-11-11 14:35 UTC · Resolved: 2025-11-11 16:10 UTC · Duration: 1.6 h
- Updates: 3 · Affected components: SMTP Delivery (Outbound Message Delivery) - SMTP Delivery - USA, SMTP Delivery - USA
- [Vendor status page: https://stspg.io/dkjsbydmg3mz](https://stspg.io/dkjsbydmg3mz)
- [Company: SparkPost](https://rewindex.com/company/sparkpost.md)

## Timeline of updates

- **investigating** 2025-11-11 14:35 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** 2025-11-11 15:01 UTC: The issue has been identified and a fix is being implemented.
- **resolved** 2025-11-11 16:10 UTC: This incident impacted a limited batch of messages injected via SMTP API.  We have quarantined the impacted the node and working on delivering the messages and isolating the root cause. The SMTP API is full operational


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Canonical: https://rewindex.com/company/sparkpost/incidents/721509613qvs · Markdown: https://rewindex.com/company/sparkpost/incidents/721509613qvs.md · JSON: https://rewindex.com/api/v1/companies/sparkpost/incidents/721509613qvs · Generated 2026-10-19T21:08:20.731Z