Changes / Klaviyo / Flow Sending Delays
Klaviyo: Major incident: Flow Sending Delays
Summary
Klaviyo reported a major degradation in flow message sending starting 2026-10-17 17:01 UTC, with some customers’ flow emails delayed; immediate sends remained unaffected. The incident was still open when archived, after 1 h 4 min at the last update. Klaviyo said it had identified the cause and was working on a fix, without specifying either.
Machine-written from the diff below (Sol; type: incident degradation). Check the diff before relying on it.
What changed
Before: not present
After: Flow Sending Delays
Before: not present
After: major
Before: not present
After: identified
Before: not present
After: 2026-10-17 17:01 UTC
Before: not present
After: Email Sending, Flow Editor, Flows - Email Sending, Flows - Flow Editor, Flows - Mobile Push Sending, Flows - Processing, Flows - Text Message Sending, Flows - WhatsApp Sending, Mobile Push Sending, Processing, Text Message Sending, WhatsApp Sending
Before: not present
After: We are investigating reports of delays affecting flow message sending. Some customers may see flow messages send later than expected. Immediate sends are not affected and are going out as expected. We will share another update as soon as we have more information.
Before: not present
After: We are continuing to investigate delays affecting some flow email sending. Immediate sends remain unaffected. We will share another update as soon as we have more information.
Before: not present
After: 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.
Before: not present
After: We are continuing to work on the fix for this issue. Some customers may continue to see flow emails send later than expected while we resolve this. Immediate sends remain unaffected. We will share another update shortly.
First version of this incident archived by Rewindex. View the live incident.
History of this incident
| When (UTC) | Change | Kind |
|---|---|---|
| Incident updated: Flow Sending Delays | Incident update | |
| Incident updated: Flow Sending Delays | Incident update | |
| Incident updated: Flow Sending Delays | Incident update | |
| Incident updated: Flow Sending Delays | Incident update | |
| Incident updated: Flow Sending Delays | Incident update | |
| Incident updated: Flow Sending Delays | Incident update | |
| Incident updated: Flow Sending Delays | Incident update | |
| Major incident: Flow Sending Delays (this change) Klaviyo reported a major degradation in flow message sending starting 2026-10-17 17:01 UTC, with some customers’ flow emails delayed; immediate sends remained unaffected. The incident was still open when archived, after 1 h 4 min at the last update. Klaviyo said it had identified the cause and was working on a fix, without specifying either. | Major incident |