Outage in SparkPost

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

Resolved Minor
November 27, 2025 - Started 22 days ago - Lasted about 1 hour
Official incident page

Incident Report

We are investigating an increase in delivery latency for some outbound messages. (NOTE: This does not impact our customers hosted in the EU.)
Components affected
SparkPost SMTP Delivery - USA

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Latest Updates ( sorted recent to last )
RESOLVED 22 days ago - at 11/27/2025 03:24PM

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.

MONITORING 22 days ago - at 11/27/2025 02:50PM

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

MONITORING 22 days ago - at 11/27/2025 02:44PM

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.

MONITORING 22 days ago - at 11/27/2025 02:23PM

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

IDENTIFIED 22 days ago - at 11/27/2025 02:22PM

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

INVESTIGATING 22 days ago - at 11/27/2025 02:22PM

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

Latest SparkPost outages

Delay in event processing. - 8 days ago
Longer than expected delays - 8 days ago
Data processing delays - 9 days ago
Increased error rates and latency from our APIs - 10 days ago
Data Process is delayed for Sparkpost US - EU - 12 days ago

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