Outage in SparkPost
Partial Outage and Delivery Issues in US-West-2 Region
Resolved MajorIncident Report
Summary AI Generated
An AWS US-West-2 region outage caused SparkPost's SMTP and Transmissions API delivery services in the USA to be fully blocked for outbound email, with messages queued internally for approximately 7.5 hours. As the AWS network recovered, SparkPost applied additional tuning to manage the backlog of queued mail and gradually restored delivery rates. The incident was fully resolved after an estimated 80–90 minute recovery window following the implementation of those optimizations.
We are investigating delivery issues caused by an ongoing AWS US West 2 region outage.
Customers may experience delays while we assess the impact to our service. We are actively monitoring the situation and will provide updates as more information becomes available.
Components affected
SparkPost SMTP Delivery - USA SparkPost Transmissions API - USA SparkPost SMTP API - USATrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
RESOLVED
about 7 hours ago - at 07/24/2026 06:44PM
This incident has been resolved.
MONITORING
about 8 hours ago - at 07/24/2026 05:29PM
We have implemented additional tuning to handle the significant influx of mail due to the AWS network outage and we are seeing improvement in delivery rates
We are seeing significant recovery and expect most mail to be fully delivered in the next 30-35 minutes. Estimated time for full recovery is 80-90 minutes.
We are continuing to look for additional optimizations and monitor the issue.
MONITORING
about 12 hours ago - at 07/24/2026 01:16PM
We are still working through the queued messages.
We are continuing to monitor the issue and continuing to accept emails.
MONITORING
about 13 hours ago - at 07/24/2026 12:08PM
We are starting to deliver mails in our US West region. We are working through the queued messages.
We are continuing to monitor the issue and continuing to accept emails.
IDENTIFIED
about 14 hours ago - at 07/24/2026 11:53AM
Outbound email delivery is blocked for our US West region. We working with our vendor resolve the issue.
We are continuing to accept emails and queue them internally. We will deliver the messages as soon as the issue is resolved.
INVESTIGATING
about 14 hours ago - at 07/24/2026 11:14AM
We are investigating delivery issues caused by an ongoing AWS US West 2 region outage.
Customers may experience delays while we assess the impact to our service. We are actively monitoring the situation and will provide updates as more information becomes available.
Latest SparkPost outages
There is a delay effecting some mail sending in EU. - 25 days ago
Issue with updating payment information - 2 months ago
Elevated 5xx Suppression List API error rates and latency for some SparkPost customers (US hosted only) - 2 months ago
Delayed delivery for some messages in EU - 3 months ago
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