Is Klaviyo down?

Beginning around 8:09 AM US/Eastern on July 23, 2026, profile imports started through the API, CSV upload, or SFTP may fail to complete, and the imported profiles may not be created. New integrations connected during this period may also be delayed in starting their initial sync. We have identified the cause and are deploying a fix. We are working to resolve this as quickly as possible and will share another update shortly.

Profile imports have recovered, and imports through the API, CSV upload, or SFTP are processing normally again. Integrations connected during the impact window are also resuming their initial syncs. Our team is working to reprocess API imports that failed during the incident. We continue to monitor closely and appreciate your patience throughout this incident.

The system remains stable, and imports through the API, CSV upload, or SFTP are processing normally. Imports that failed during the incident were not reprocessed automatically. If an import you started between 8:00 AM and 11:00 AM US/Eastern on July 23, 2026 did not complete, please re-run it to ensure those profiles are imported. This incident has been resolved.

We are currently investigating an issue impacting SMS subscriptions, delays in SMS sending, and errors when creating or scheduling SMS and WhatsApp campaigns. We are working to restore normal service as quickly as possible. We will share another update as soon as we have more information.

We have identified the cause of the issue and a fix has been implemented. We are starting to see improvements in system performance.

System performance for SMS opt-in forms, sending, and campaign creation and scheduling remains stable. We continue to monitor closely and appreciate your patience throughout this incident.

SMS subscriptions, SMS sending, and the creation and scheduling of SMS and WhatsApp campaigns are operating as expected. This incident has been resolved.

At 4:00 PM US/Eastern on July 8, 2026, we identified delays syncing product updates from integrations using webhooks. This is causing catalog data, including in Templates and the Customer Hub, to not update in real time. Customer may see product data being out of date by up to 4 hours. Sending is not impacted but the product data in templates may not reflect real-time information. We are working to resolve this as quickly as possible and will share another update shortly.

As of 9:45 PM US/Eastern on July 8, 2026, we paused processing new webhooks for product catalogs while we continue working on a fix. Catalog data, including in Templates and Customer Hub, will remain out of date until syncing resumes. Our engineering team is actively working to restore realtime catalog updates. We'll provide updates as soon as more information is available.

As of 11:13 PM US/Eastern on July 8, 2026, we have resumed processing webhooks. This means all new webhooks from integrations which use webhooks to update products are now syncing in real time. Our Engineering Team is working implement a repair to catch up on any product update webhooks from during window of impact (9:45 PM and 11:13 PM US/Eastern July 8, 2026). We will confirm once the repair has been complete and the incident has been fully resolved.

Product updates from ecommerce integrations are continuing to sync normally in real time. A background repair to fully update records from the earlier impact window (9:45 PM to 11:13 PM US/Eastern on July 8, 2026) is still in progress. We will confirm once this repair is complete.

The repair to catch up on product update webhooks from the window of impact has been completed, and affected product data is up to date. This incident has been resolved.

Customers may be experiencing slower than usual performance when loading or navigating Klaviyo, and some sends may be delayed. We are actively investigating. We will share another update as soon as we have more information.

Performance issues affecting login and general navigation in Klaviyo have recovered, and those areas are now operating normally. Some customers may still be experiencing delays with sends while we work to fully restore normal processing. We have identified the cause and are working to resolve the remaining impact as quickly as possible. We will share another update shortly.

Campaign and flow sends are now delayed by less than 30 minutes and are continuing to recover. Login and navigation are operating normally. We will share another update shortly.

Sending delays have recovered, and login and navigation are operating normally. We continue to monitor closely and appreciate your patience throughout this incident.

All systems are operating normally. This incident has been resolved.

Starting at 02:30AM US/Eastern on 07/02/2026, a subset of customers are currently experiencing an increase in bounced emails to Yahoo and AOL recipients with the reason of "554 Message not allowed - [PH01] Email not accepted for policy reasons.". Our Engineering and Deliverability teams are actively investigating and working with Yahoo to resolve the issue. We do not recommend resending to those bounced recipients at this moment in time. CCP: https://docs.google.com/document/d/1YdH_E0iEhH_GkCjVoxBJ2-y32iPKf5JnrANic-R_s7k/edit?tab=t.0

The block within the Yahoo infrastructure that resulted in these elevated bounces has been resolved. Customers can safely resend to bounced recipients from this time period. This incident has been resolved.