Klaviyo incident

Issues with Campaign Sending and Scheduling

Resolved after 1 hour 10 minutes, affecting Email Sending and Text Message Sending and 1 more, on January 12, 2026.

monitoring Jan 12, 2026, 12:05 PM UTC

A fix has been implemented and we are monitoring results. Campaign sending and scheduling is back to normal, and all delayed campaigns have been replayed.

Started
Jan 12, 2026, 11:12 AM UTC
Resolved
Jan 12, 2026, 12:23 PM UTC
Duration
1h 10m
Detected by Pingoru
Jan 12, 2026, 11:12 AM UTC

Affected components

Email SendingText Message SendingMobile Push Sending

Update timeline

  1. investigating Jan 12, 2026, 11:12 AM UTC

    Beginning around 5am US Eastern time, we began observing delays in campaign scheduling and sending. New campaigns, and scheduled RAST (calculate Recipient at Send Times) campaigns, are unable to send. However non-RAST campaigns that were scheduled prior to 5am US Eastern Time are processing as usual. We do not expect data loss. We are actively working to resolve the incident and will provide updates as soon as possible.

  2. identified Jan 12, 2026, 11:51 AM UTC

    As of 6:45am US Eastern, the issue has been identified and a fix implemented. Any new scheduled or sent campaigns should process, with slight delays. We are actively replaying any campaigns that were delayed.

  3. monitoring Jan 12, 2026, 12:05 PM UTC

    A fix has been implemented and we are monitoring results. Campaign sending and scheduling is back to normal, and all delayed campaigns have been replayed.

  4. resolved Jan 12, 2026, 12:23 PM UTC

    This incident has been resolved.

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