Outage in SparkPost

Webhook delays for some SparkPost customers (US hosted only)

Resolved Minor

November 20, 2025 - Started 4 months ago - Lasted about 6 hours
Official incident page

Incident Report

Our webhook data delivery services are running behind and some customers may see a delay in data streamed to their webhook endpoints. Message injection and outbound message delivery is not impacted - all messages are flowing as expected. Note: This issue does not impact our SparkPost customers hosted in the EU.

Components affected

SparkPost Event Webhooks - USA

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Latest Updates ( sorted recent to last )

RESOLVED 4 months ago - at 11/20/2025 10:09PM

This issue has been resolved. We apologize for any inconvenience it may have cause.

MONITORING 4 months ago - at 11/20/2025 05:16PM

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

IDENTIFIED 4 months ago - at 11/20/2025 04:12PM

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

INVESTIGATING 4 months ago - at 11/20/2025 03:56PM

Our webhook data delivery services are running behind and some customers may see a delay in data streamed to their webhook endpoints.

Message injection and outbound message delivery is not impacted - all messages are flowing as expected.
Note: This issue does not impact our SparkPost customers hosted in the EU.

Latest SparkPost outages

Email delivery in US region affected - 21 days ago

Outbound message delivery is delayed/slow for some SparkPost customers (US and EU regions) - 28 days ago

Microsoft Mail Delivery Delays and Temporary Rejections - about 1 month ago

Elevated 5xx Transmissions API error rates and latency for some SparkPost customers (US hosted only) - about 1 month ago

Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only) - about 1 month ago

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