SparkPost incident

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

Minor Resolved View vendor source →

SparkPost experienced a minor incident on November 27, 2025 affecting SMTP Delivery - USA, lasting 1h 1m. The incident has been resolved; the full update timeline is below.

Started
Nov 27, 2025, 02:22 PM UTC
Resolved
Nov 27, 2025, 03:24 PM UTC
Duration
1h 1m
Detected by Pingoru
Nov 27, 2025, 02:22 PM UTC

Affected components

SMTP Delivery - USA

Update timeline

  1. investigating Nov 27, 2025, 02:22 PM UTC

    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 Nov 27, 2025, 02:22 PM UTC

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

  3. monitoring Nov 27, 2025, 02:23 PM UTC

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

  4. monitoring Nov 27, 2025, 02:44 PM UTC

    The MTA1 cluster is beginning to stabilize and we are seeing active recovery. We will continue to monitor and provide updates as the cluster fully recovers.

  5. monitoring Nov 27, 2025, 02:50 PM UTC

    We continue to see significant recovery on the delayed messages. Continuing to monitor and will post the next status after full recovery.

  6. resolved Nov 27, 2025, 03:24 PM UTC

    We have seen fully recovery from this delay event. A postmortem will be posted shortly detailing the root cause and steps we have taken to prevent a reoccurrence.