Outage in SparkPost

Email delivery in US region affected

Resolved Major

March 12, 2026 - Started 21 days ago - Lasted about 10 hours
Official incident page

Incident Report

Summary AI Generated

SparkPost experienced a major incident affecting email delivery in the US region, with users experiencing elevated delays when sending emails through SMTP delivery services. The issue impacted the US region's email delivery infrastructure for approximately 9.7 hours. The system was fully recovered and the incident was resolved after monitoring confirmed stable operations.

We are currently investigating issues with delivery of email impacting US region.

Components affected

SparkPost SMTP Delivery - USA

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Latest Updates ( sorted recent to last )

RESOLVED 21 days ago - at 03/12/2026 11:25AM

This incident has been resolved.

INVESTIGATING 21 days ago - at 03/12/2026 08:00AM

Email delivery in US is impacted, experiencing elevated delays.

MONITORING 21 days ago - at 03/12/2026 07:48AM

System is fully recovered and under monitoring.

INVESTIGATING 21 days ago - at 03/12/2026 06:51AM

We are currently investigating issues with delivery of email impacting US region.

Latest SparkPost outages

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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