Issues with Campaign Sending and Scheduling

What to do

• Check whether you use Klaviyo Email Sending, Text Message Sending, Mobile Push Sending in us. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 1h 11m it lasted.

  Anything that failed between 2026-01-12 11:12 UTC and 2026-01-12 12:23 UTC may need a replay.

• Subscribe to Klaviyo's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=klaviyo works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from Klaviyo 4

1. investigatingJan 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.

   provider

2. identifiedJan 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.

   provider

3. monitoringJan 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.

   provider

4. resolvedJan 12, 2026, 12:23 PM UTC

   This incident has been resolved.

   provider

Corrections

None so far.

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