Flow sending delays

What to do

• Check whether you use Klaviyo Email Sending, Text Message Sending, WhatsApp Sending, Mobile Push Sending and 1 more. 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 2h 3m it lasted.

  Anything that failed between 2026-09-21 15:56 UTC and 2026-09-21 17:58 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 6

1. investigatingSep 21, 2026, 3:56 PM UTC

   We are investigating reports of delays affecting flow message sending. Some customers may see flow messages send later than expected. We will share another update as soon as we have more information.

   provider

2. investigatingSep 21, 2026, 3:56 PM UTC

   We are continuing to investigate this issue.

   provider

3. identifiedSep 21, 2026, 4:26 PM UTC

   We have identified the cause of the delays affecting flow message sending and are working on a fix. Some customers may continue to see flow messages send later than expected while we resolve this. We will share another update shortly.

   provider

4. monitoringSep 21, 2026, 4:42 PM UTC

   Flow message sending is recovering, and delays are clearing. Some customers may still see flow messages send later than expected as remaining processing catches up. We continue to monitor closely and appreciate your patience throughout this incident.

   provider

5. monitoringSep 21, 2026, 5:43 PM UTC

   Delays have now largely cleared but some customers may still see flow messages send later than expected. We continue to monitor closely and will share another update shortly.

   provider

6. resolvedSep 21, 2026, 5:58 PM UTC

   Flow message sending has fully recovered and is processing at normal speeds. Delayed messages were not lost and have since been delivered. This incident has been resolved.

   provider

Corrections

None so far.

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