ChangesSparkPostElevated 5xx Transmissions API error rates and latency for some SparkPost customers (US hosted only)
SparkPost: Major incident: Elevated 5xx Transmissions API error rates and latency for some SparkPost customers (US hosted only)
Summary
Summary pending. The diff below shows exactly what changed.
Incident page: the full timeline of updates
What changed
Struck in red is what SparkPost removed; blue is what they added. Muted text is unchanged context.
Before: not present
After: Elevated 5xx Transmissions API error rates and latency for some SparkPost customers (US hosted only)
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After: major
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After: resolved
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After: 2026-02-24 19:07 UTC
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After: 2026-02-24 19:41 UTC
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After: Transmissions API - Transmissions API - USA, Transmissions API - USA
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After: 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.
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After: We are continuing to investigate this issue.
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After: We are continuing to investigate this issue. We still see 5xx errors on mail injections and degradation.
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After: The team has identified the root cause. There is a core networking issue that has impacted sending across the clusters.
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After: A fix has been implemented and we are monitoring the results.
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After: This incident has been resolved.
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History of this incident
Tuesday, February 24
1 incident change
- MajorMajor incident
Elevated 5xx Transmissions API error rates and latency for some SparkPost customers (US hosted only)this change