[Resolved, Monitoring] Delayed Email Deliveries Related to AWS Outage

Incident Report for Letterhead

Resolved

This incident has been resolved.
Posted Jul 24, 2026 - 15:11 EDT

Update

The queues have drained and deliveries are snappy. We are going to continue to monitor for awhile, but updating these components to "operational."
Posted Jul 24, 2026 - 14:48 EDT

Update

One of our upstream providers (https://status.sparkpost.com/incidents/gz7xng93whxg) estimates about a ninety-minute ETA to full throughput. We apologize for the inconvenience.
Posted Jul 24, 2026 - 13:33 EDT

Update

Newly sent emails are still periodically delaying. You do not have to send them again, we are continuing to deliver them.
Posted Jul 24, 2026 - 12:58 EDT

Update

The message queue continues to drain and we are still monitoring. Thank you for your patience.
Posted Jul 24, 2026 - 10:09 EDT

Update

The outage appears to be resolved and our services have largely been unaffected. We are changing the various statuses to "Operational" but will leave this status update up for awhile.
Posted Jul 24, 2026 - 09:28 EDT

Update

We are continuing to monitor for any further issues.
Posted Jul 24, 2026 - 09:01 EDT

Monitoring

We are starting to deliver mail that had been affected by that regional outage. We are currently working through the queued messages.
Posted Jul 24, 2026 - 08:10 EDT

Update

AWS is reporting initial signs of recovery (https://health.aws.amazon.com/health/status).
Posted Jul 24, 2026 - 08:04 EDT

Update

We are continuing to work on a fix for this issue.
Posted Jul 24, 2026 - 07:58 EDT

Identified

The current assessment is that some outbound email delivery is blocked by this outage. Emails are continuing to be accepted and queued internally, and will be delivered as soon as the issue is resolved. You ought to expect that your newsletters stay in a "sending" status for a prolonged period.
Posted Jul 24, 2026 - 07:57 EDT

Investigating

An ongoing AWS US West 2 region outage may result in delivery delays or temporary failures. We are assessing the outage's impact on our own service, actively monitoring the situation, and will provide updates as more information becomes available.
Posted Jul 24, 2026 - 07:23 EDT
This incident affected: Delivery (Outbound Email Deliverability (Shared Pools), Outbound Email Deliverability (Dedicated Pools)), API (Marketing API), Services (Email Service Provider, Metrics), and Applications (Newsletters).