Outage in SparkPost

Elevated percentage of API calls failing

Resolved Minor
May 13, 2025 - Started 5 months ago - Lasted about 6 hours
Official incident page

Incident Report

We are investigating an unexpected but small increase in the percentage of API calls failing since 01:30UTC. Approximately 0.015% of API calls are failing with a HTTP 504 (Gateway timeout) error. We will update this incident as we have more information.
Components affected
SparkPost Metrics API - USA SparkPost Events API - USA SparkPost Transmissions API - USA SparkPost Transmissions API - EUROPE SparkPost Metrics API - EUROPE SparkPost Sending Domains API - EUROPE SparkPost SMTP API - EUROPE SparkPost Events API - EUROPE SparkPost SMTP API - USA SparkPost Sending Domains API - USA

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Latest Updates ( sorted recent to last )
RESOLVED 5 months ago - at 05/13/2025 11:29AM

After a period of extended monitoring, we have confirmed the remediation has completely resolved the issue. Requests and error rates have been normal since 06:27UTC

IDENTIFIED 5 months ago - at 05/13/2025 06:26AM

We have identified the cause as a set of stale IPs for an upstream service. We are now validating the approach for remediation.

INVESTIGATING 5 months ago - at 05/13/2025 05:52AM

We are still investigating. During the period, the error rate has remained low as initially reported, approximately ~0.015%.

INVESTIGATING 5 months ago - at 05/13/2025 05:22AM

We are investigating an unexpected but small increase in the percentage of API calls failing since 01:30UTC. Approximately 0.015% of API calls are failing with a HTTP 504 (Gateway timeout) error. We will update this incident as we have more information.

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