SparkPost incident
Elevated 5xx Transmissions API error rates and latency for some SparkPost customers (US hosted only)
Resolved after 34 minutes, affecting Transmissions API - USA, on February 24, 2026.
A fix has been implemented and we are monitoring the results.
Affected components
Update timeline
- investigating Feb 24, 2026, 07:07 PM UTC
We are experiencing an elevated level of errors and latency on the Transmissions API (injection API) for some SparkPost customers. Please retry any 5xx error. Note: This issue does not impact SparkPost customers hosted in the EU.
- investigating Feb 24, 2026, 07:07 PM UTC
We are continuing to investigate this issue.
- investigating Feb 24, 2026, 07:25 PM UTC
We are continuing to investigate this issue. We still see 5xx errors on mail injections and degradation.
- identified Feb 24, 2026, 07:34 PM UTC
The team has identified the root cause. There is a core networking issue that has impacted sending across the clusters.
- monitoring Feb 24, 2026, 07:38 PM UTC
A fix has been implemented and we are monitoring the results.
- resolved Feb 24, 2026, 07:41 PM UTC
This incident has been resolved.
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