SparkPost: Increased message delays in US and EU due to DNS resolution errors
Affected components: SMTP Delivery (Outbound Message Delivery) - SMTP Delivery - USASMTP Delivery - USASMTP Delivery - EUROPESMTP Delivery (Outbound Message Delivery) - SMTP Delivery - EUROPE
Timeline of updates
- identified
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.
- identified
We are continuing to rollout the new root signing keys from ICANN. We continue to see recovery across our global clusters.
- identified
We are continuing to work on a fix for this issue.
- monitoring
A fix has been implemented and we are monitoring the results.
- resolved
This incident has been resolved.
Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab).