rewindex

CompaniesSparkPostIncidents

SparkPost: Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)

MinorStatus: resolvededitedStarted Resolved (50 min)6 updatesstatus.sparkpost.com (opens in new tab)

Affected components: SMTP Delivery - Outbound Message Delivery - SMTP Delivery - USA

Timeline of updates

  1. investigating

    We are investigating an increase in delivery latency for some outbound messages. (NOTE: This does not impact our customers hosted in the EU.)

  2. identified

    The issue has been identified and a fix is being implemented.

  3. monitoring

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

  4. identified

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

  5. monitoring

    A fix was implemented and we are seeing sustained delivery recovery.

  6. resolved

    This incident has been resolved.

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.

Impact, status and times are the vendor’s own, as last archived. View on status.sparkpost.com (opens in new tab).

Cite this

Status incident (vendor impact label: minor) posted by SparkPost, started 2026-10-28 19:48 UTC, resolved after 50 min, 6 update(s); edited after publishing.

Title
Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)
Vendor
SparkPost
Date
URL
https://rewindex.com/company/sparkpost/incidents/dgp65ql0ksld

SparkPost profileRecent SparkPost incidentsAll outages on October 28, 2026SparkPost in October 2026MarkdownJSON