Critical incident

SparkPost: Partial Outage and Delivery Issues in US-West-2 Region

Affected: Transmissions API - USA, SMTP API - USA, SMTP Delivery - USA

Current status of SparkPost: Operational — live SparkPost status

Timeline

1. Jul 24, 2026, 11:14 UTC
   investigating
   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.
2. Jul 24, 2026, 11:53 UTC
   identified
   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.
3. Jul 24, 2026, 12:08 UTC
   monitoring
   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.
4. Jul 24, 2026, 13:16 UTC
   monitoring
   We are still working through the queued messages. We are continuing to monitor the issue and continuing to accept emails.
5. Jul 24, 2026, 17:29 UTC
   monitoring
   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.
6. Jul 24, 2026, 18:44 UTC
   resolved
   This incident has been resolved.

Updates as published by SparkPost (original).