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Outage in Klaviyo

Flow sending delays

Resolved Minor
September 17, 2026 - Started 1 day ago - Lasted about 3 hours
Official incident page

Incident Report

Summary AI Generated

Klaviyo experienced a 2.6-hour incident on September 17, 2026, during which delays affected flow triggering and email sending, causing messages to send later than expected. The root cause was identified and addressed, with sending speeds gradually recovering before full resolution. All delayed messages were retained and successfully delivered once the incident was resolved.

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.

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Latest Updates ( sorted recent to last )
RESOLVED 1 day ago - at 09/17/2026 07:46PM

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.

MONITORING 1 day ago - at 09/17/2026 07:21PM

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.

IDENTIFIED 1 day ago - at 09/17/2026 06:30PM

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.

IDENTIFIED 1 day ago - at 09/17/2026 05:31PM

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.

INVESTIGATING 1 day ago - at 09/17/2026 05:10PM

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.

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