Klaviyo experienced a minor incident on April 1, 2025 affecting Campaign Email Sending and SMS Sending - Toll Free Number SMS and 1 more component, lasting 9h 23m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Apr 01, 2025, 05:44 PM UTC
We are currently experiencing delays of up to an hour when sending email, SMS, and push notifications as of 12:30 PM (US Eastern) on April 1, 2025. We are actively investigating the issue to restore real-time sending.
- identified Apr 01, 2025, 07:46 PM UTC
As of 3:37 PM (US Eastern), the issue has been identified and a fix is being implemented. All delayed campaigns will be resent.
- monitoring Apr 01, 2025, 11:54 PM UTC
Starting at 3:37 PM (US Eastern), campaigns began sending in real-time and we began resending delayed campaigns. We expect that all remaining delayed campaigns will be sent within the next 90 minutes. Transactional flow messages were not impacted by this incident. However, non-transactional flows scheduled to send between 12:22 -15:26ET were not delivered and will not be replayed to avoid untimely messages.
- resolved Apr 02, 2025, 03:08 AM UTC
All impacted campaigns have now been sent. This incident is resolved.