Delays affecting campaign scheduling, preview emails, and double opt-in confirmations

Summary

Delays affecting campaign scheduling, preview emails, and double opt-in confirmations

The email subscription and campaign features affected by this incident remain stable and are operating normally. Double opt-in confirmation emails, preview emails, and estimated recipient counts have returned to normal operation. Confirmation emails that failed to send during the incident are being resent. This incident has been resolved.

• Started

  Aug 5, 2026 · 12:47 PM

• Resolved

  Aug 5, 2026 · 1:54 PM

• Duration

  1h 7m

• Severity

  Minor

• ◐

  Investigating

  Aug 5 · 12:47 PM Klaviyo

  Beginning around 12:00 PM US/Eastern on August 5, 2026, we began investigating an issue affecting some email subscription and campaign features. Customers using double opt-in may find that new subscribers are not receiving confirmation emails as expected. Some users may encounter errors when sending preview emails, scheduling campaigns, or checking estimated recipient counts. Our team is working to resolve this. We will share another update as soon as we have more information.

• ◆

  Identified

  Aug 5 · 1:26 PM Klaviyo

  We have identified the source of the issue affecting some email subscription and campaign features. Customers may continue to see errors when sending preview emails and customers using double opt-in may find that new subscribers are not receiving confirmation emails. Campaign scheduling has recovered and is working as expected. We are working to resolve this as quickly as possible and will share another update shortly.

• ◉

  Monitoring

  Aug 5 · 1:36 PM Klaviyo

  A fix has been deployed and the affected email subscription and campaign features have recovered. Double opt-in confirmation emails are sending again, and preview emails and estimated recipient counts are working as expected. We continue to monitor closely and appreciate your patience throughout this incident.

• ✓

  Resolved

  Aug 5 · 1:54 PM Klaviyo

  The email subscription and campaign features affected by this incident remain stable and are operating normally. Double opt-in confirmation emails, preview emails, and estimated recipient counts have returned to normal operation. Confirmation emails that failed to send during the incident are being resent. This incident has been resolved.