SparkPost incident

Increased message delays in US and EU due to DNS resolution errors

Minor Resolved View vendor source →

SparkPost experienced a minor incident on October 11, 2026 affecting SMTP Delivery - USA and SMTP Delivery - EUROPE, lasting 3h 5m. The incident has been resolved; the full update timeline is below.

Started
Oct 11, 2026, 05:51 PM UTC
Resolved
Oct 11, 2026, 08:57 PM UTC
Duration
3h 5m
Detected by Pingoru
Oct 11, 2026, 05:51 PM UTC

Affected components

SMTP Delivery - USASMTP Delivery - EUROPE

Update timeline

  1. identified Oct 11, 2026, 05:51 PM UTC

    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.

  2. identified Oct 11, 2026, 06:09 PM UTC

    We are continuing to rollout the new root signing keys from ICANN. We continue to see recovery across our global clusters.

  3. identified Oct 11, 2026, 06:17 PM UTC

    We are continuing to work on a fix for this issue.

  4. monitoring Oct 11, 2026, 06:17 PM UTC

    A fix has been implemented and we are monitoring the results.

  5. resolved Oct 11, 2026, 08:57 PM UTC

    This incident has been resolved.