SMS Events Processing Delays

What to do

• Check whether you use Klaviyo Segments, Processing, Analytics in us. Check your stack

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• Confirm your retries, queues and scheduled jobs caught up after the 1h 27m it lasted.

  Anything that failed between 2025-10-29 18:16 UTC and 2025-10-29 19:43 UTC may need a replay.

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Updates from Klaviyo 5

1. identifiedOct 29, 2025, 6:16 PM UTC

   Starting at 1:00 PM US/Eastern, we began experiencing delays of up to 40 minutes for SMS events processing. SMS Sending is not impacted. We have identified the issue and are in the process of reverting a change to restore normal processing. We'll provide updates as soon as more information is available.

   provider

2. identifiedOct 29, 2025, 6:27 PM UTC

   We want to acknowledge that downstream services (Segments and Flows) relying on the SMS events will also be impacted, until the event processing has caught up, which we expect to happen shortly. We'll continue to provide updates as they are available.

   provider

3. identifiedOct 29, 2025, 7:12 PM UTC

   We are still working to restore normal processing of SMS events. A subset of customers may see delays of up to 90 minutes at this time. SMS Sending remains unaffected.

   provider

4. monitoringOct 29, 2025, 7:27 PM UTC

   We have mitigated the delays and we expect SMS event processing to be fully caught up within the next 20 minutes. There was no data loss as a result of this incident.

   provider

5. resolvedOct 29, 2025, 7:43 PM UTC

   This incident has been resolved.

   provider

Corrections

None so far.

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