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Iterable: Email send delays for some US-hosted SparkPost traffic
Iterable reported a major degradation in Global Campaign Sends: US-hosted customers using SparkPost experienced email delays from elevated 5xx errors and Transmissions API latency. It started at 2026-02-24 19:51 UTC and resolved at 2026-02-24 19:52 UTC, lasting 1 minute. EU-hosted traffic and other ESPs were unaffected; SparkPost’s API issue was resolved.
Machine-written from the archived incident (Sol). Check the timeline before relying on it.
Affected components: Global Campaign Sends
Timeline of updates
- monitoring
Email sends for US-hosted customers using SparkPost were delayed due to elevated 5xx errors and increased API latency from SparkPost’s Transmissions API. EU-hosted traffic was not impacted. All customers using ESPs other than Sparkpost were similarly not impacted. SparkPost has indicated the incident is resolved. We’re monitoring outbound email queues to ensure sends are fully processing as expected. If you continue to experience issues, please contact Support.
- resolved
SparkPost’s API issue has been resolved, and we’re no longer seeing elevated 5xx errors or increased latency. Incident has resolved.
Rewindex changes for this incident
- Major incident: Email send delays for some US-hosted SparkPost traffic 2026-02-24 19:51 UTC
Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). Iterable profile · Recent Iterable incidents · Markdown · JSON