Outage in SparkPost
Increased message delays in US and EU due to DNS resolution errors
Resolved MinorIncident Report
Summary AI Generated
SparkPost experienced a 3.2-hour incident affecting SMTP delivery in the US and EU regions, where a DNSSEC validation issue — triggered by a scheduled internet root DNS signing key update — caused a subset of internal resolvers to intermittently fail to resolve recipient domains. Affected messages were deferred rather than dropped or bounced, with retries succeeding via healthy resolvers, resulting in delayed delivery and elevated delay events in webhooks, event logs, and reporting. SparkPost resolved the issue by rolling out updated root signing keys from ICANN and applying a fix across their global clusters.
We are investigating an increase in delayed (deferred) messages in both our US and EU regions, beginning at approximately 14:40 UTC on October 11. A subset of our internal DNS resolvers are intermittently failing to resolve recipient domains, causing some delivery attempts to be temporarily deferred.
Affected messages are not being dropped or bounced. Retries are succeeding as they are routed to healthy resolvers, so impacted messages are being delivered with additional latency. Customers may observe an elevated number of delay events in webhooks, event logs, and reporting during this time.
We have identified the cause as a DNSSEC validation issue on a portion of our resolver fleet related to a scheduled update of the internet's root DNS signing key, and are applying a fix. No action is required from customers. We will provide an update within 60 minutes or as soon as we have more information.
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Latest Updates ( sorted recent to last )
RESOLVED
3 days ago - at 10/11/2026 08:57PM
This incident has been resolved.
MONITORING
3 days ago - at 10/11/2026 06:17PM
A fix has been implemented and we are monitoring the results.
IDENTIFIED
3 days ago - at 10/11/2026 06:17PM
We are continuing to work on a fix for this issue.
IDENTIFIED
3 days ago - at 10/11/2026 06:09PM
We are continuing to rollout the new root signing keys from ICANN. We continue to see recovery across our global clusters.
IDENTIFIED
3 days ago - at 10/11/2026 05:51PM
We are investigating an increase in delayed (deferred) messages in both our US and EU regions, beginning at approximately 14:40 UTC on October 11. A subset of our internal DNS resolvers are intermittently failing to resolve recipient domains, causing some delivery attempts to be temporarily deferred.
Affected messages are not being dropped or bounced. Retries are succeeding as they are routed to healthy resolvers, so impacted messages are being delivered with additional latency. Customers may observe an elevated number of delay events in webhooks, event logs, and reporting during this time.
We have identified the cause as a DNSSEC validation issue on a portion of our resolver fleet related to a scheduled update of the internet's root DNS signing key, and are applying a fix. No action is required from customers. We will provide an update within 60 minutes or as soon as we have more information.
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