SparkPost: Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)
Affected components: SMTP Delivery - Outbound Message Delivery - SMTP Delivery - USA
Timeline of updates
- investigating
We are investigating a small increase in delivery latency for some outbound messages. (NOTE: This does not impact our customers hosted in the EU.)
- identified
We have identified the issue and are working on a resolution; delivery latencies are recovering.
Changes Rewindex caught on this incident
Archive proof
Rewindex commits each version of an incident it captures to a daily checkpoint, chains it to the day before, and has the checkpoint timestamped by FreeTSA and DigiCert. That proves these records existed by then and have not been changed since, by anyone, Rewindex included.
How the archive is checked, and what it cannot prove.
First version captured
In the 2026-10-30 checkpoint, timestamped by FreeTSA and DigiCert on . Record hash
bdb4efe05244264a…Version 2 captured
In the 2026-10-30 checkpoint, timestamped by FreeTSA and DigiCert on . Record hash
58036e8745bb8ed4…
Impact, status and times are the vendor’s own, as last archived. View on status.sparkpost.com (opens in new tab).