Delayed message sending

Incident Report for Klaviyo

Resolved

All impacted campaigns have now been sent. This incident is resolved.
Posted Apr 01, 2025 - 23:08 EDT

Monitoring

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.
Posted Apr 01, 2025 - 19:54 EDT

Identified

As of 3:37 PM (US Eastern), the issue has been identified and a fix is being implemented. All delayed campaigns will be resent.
Posted Apr 01, 2025 - 15:46 EDT

Investigating

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.
Posted Apr 01, 2025 - 13:44 EDT
This incident affected: Email Sending (Campaign Email Sending, Flow Email Sending), SMS Sending (SMS Sending - Toll Free Number SMS, SMS Sending - Toll Free Number MMS, SMS Sending - Short Code SMS, SMS Sending - Short Code MMS, SMS Sending - Other), and Mobile Push Sending.