Klaviyo: Issues with Campaign Sending and Scheduling

Impact: majorStatus: resolvedStarted 2026-01-12 11:12 UTCResolved 2026-01-12 12:23 UTC (1.2 h)4 updatesSource: stspg.io

Summary

Klaviyo reported a major campaign scheduling and sending incident starting 2026-01-12 11:12 UTC, lasting 1 h 10 min and resolved at 2026-01-12 12:23 UTC. New campaigns and scheduled RAST campaigns could not send; previously scheduled non-RAST campaigns continued processing. A fix restored service and all delayed campaigns were replayed; no data loss was expected.

Machine-written from the archived incident (Sol). Check the timeline before relying on it.

Affected components: Mobile Push SendingSMS Sending - SMS Sending - OtherText Message SendingEmail SendingEmail Sending - Campaign Email Sending

Timeline of updates

investigating2026-01-12 11:12 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.
identified2026-01-12 11:51 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.
monitoring2026-01-12 12:05 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.
resolved2026-01-12 12:23 UTC
This incident has been resolved.

Rewindex changes for this incident

Major incident: Issues with Campaign Sending and Scheduling 2026-01-12 11:12 UTC

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). Klaviyo profile · Recent Klaviyo incidents · Markdown · JSON