Outage in SparkPost
Outbound message delivery is delayed/slow for some SparkPost customers (US hosted only)
Resolved MinorIncident Report
Summary AI Generated
SparkPost experienced a 57-minute delay in outbound email delivery affecting some US-hosted customers, with user reports confirming delays specifically to Office 365 recipients. EU-hosted customers were unaffected. A fix was implemented and the incident was resolved.
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 - USATrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
RESOLVED
about 5 hours ago - at 09/17/2026 10:00AM
This incident has been resolved.
MONITORING
about 5 hours ago - at 09/17/2026 09:47AM
A fix has been implemented and we are monitoring the results.
INVESTIGATING
about 6 hours ago - at 09/17/2026 09:06AM
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
Health Score and Cohort data is delayed - 3 days ago
Outbound message delivery is delayed/slow for some SparkPost customers (EU hosted only) - 29 days ago
Partial Outage and Delivery Issues in US-West-2 Region - about 2 months ago
There is a delay effecting some mail sending in EU. - 3 months ago
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