Klaviyo incident

Flow sending delays

Resolved after 2 hours 35 minutes, affecting Email Sending and Processing and 1 more, on September 17, 2026.

resolved Sep 17, 2026, 07:46 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.

Started
Sep 17, 2026, 05:10 PM UTC
Resolved
Sep 17, 2026, 07:46 PM UTC
Duration
2h 35m
Detected by Pingoru
Sep 17, 2026, 05:10 PM UTC

Affected components

Email SendingProcessingWhatsApp SendingText Message SendingMobile Push Sending

Update timeline

  1. investigating Sep 17, 2026, 05:10 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.

  2. identified Sep 17, 2026, 05:31 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.

  3. identified Sep 17, 2026, 06:30 PM UTC

    We are seeing early signs of improvement and continue to work towards full recovery. Customers may still see flow messages send later than expected. We will share another update shortly.

  4. monitoring Sep 17, 2026, 07:21 PM UTC

    Flow message sending is recovering, and delays are continuing to clear. 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.

  5. resolved Sep 17, 2026, 07:46 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.

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