Changes / Iterable / Email send delays for some US-hosted SparkPost traffic
Iterable: Major incident: Email send delays for some US-hosted SparkPost traffic
Summary
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 diff below (Sol; type: incident degradation). Check the diff before relying on it.
What changed
Before: not present
After: Email send delays for some US-hosted SparkPost traffic
Before: not present
After: major
Before: not present
After: resolved
Before: not present
After: 2026-02-24 19:51 UTC
Before: not present
After: 2026-02-24 19:52 UTC
Before: not present
After: Global Campaign Sends
Before: not present
After: 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.
Before: not present
After: SparkPost’s API issue has been resolved, and we’re no longer seeing elevated 5xx errors or increased latency. Incident has resolved.
First version of this incident archived by Rewindex. View the live incident.
History of this incident
| When (UTC) | Change | Kind |
|---|---|---|
| Major incident: Email send delays for some US-hosted SparkPost traffic (this change) 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. | Major incident |