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Outage in Klaviyo

SMS Event Processing Delays

Resolved Minor
May 19, 2026 - Started 2 days ago - Lasted about 4 hours
Official incident page

Incident Report

Summary AI Generated

Klaviyo experienced a 3.9-hour incident where SMS event processing was delayed by 2-3 hours, affecting analytics, segmentation, flow triggering, and reporting while SMS message delivery continued normally. The delays impacted SMS event-triggered flows, real-time segments built on SMS data, and caused some customers to encounter errors when creating RCS agents and viewing videos. The engineering team identified and resolved the root cause, restoring real-time SMS event processing by 6:38 PM ET on May 19, 2026.

SMS event processing is delayed by approximately 2–3 hours. SMS sending is not impacted and recipients are receiving messages at the expected send times. This is impacting when SMS-related events appear in customer accounts, which may cause a delay in SMS event-triggered flows, real-time segments built on SMS event data, and reporting. Our team is actively investigating and we'll provide updates as soon as more information is available.

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Latest Updates ( sorted recent to last )
RESOLVED 2 days ago - at 05/20/2026 12:30AM

SMS events have been restored to real time processing as of 6:38 PM ET on May 19, 2026. Our Engineering team has monitored performance and see that systems have fully recovered. This incident has been resolved.

IDENTIFIED 2 days ago - at 05/19/2026 10:21PM

We have identified the cause of the issue and SMS event processing is recovering. Delays in processing SMS events are currently around 3 hours and continue to decrease. SMS campaign sending continues to be unaffected and recipients are continuing to receive messages at the expected send times. Customers may continue to see downstream delay in SMS event-triggered flow sending, real-time segments built on SMS event data, and reporting until processing has fully caught up. Customers may also encounter errors when creating and registering RCS agents, and when viewing videos within the platform. We'll provide updates as soon as more information is available.

INVESTIGATING 2 days ago - at 05/19/2026 08:36PM

SMS event processing is delayed by approximately 2–3 hours. SMS sending is not impacted and recipients are receiving messages at the expected send times. This is impacting when SMS-related events appear in customer accounts, which may cause a delay in SMS event-triggered flows, real-time segments built on SMS event data, and reporting. Our team is actively investigating and we'll provide updates as soon as more information is available.

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