Rudderstack incident

Mailchimp integration delivery issues for free, starter and growth customers in US

Minor Resolved View vendor source →

Rudderstack experienced a minor incident on December 10, 2025 affecting Integrations, lasting 16d 16h. The incident has been resolved; the full update timeline is below.

Started
Dec 10, 2025, 12:00 AM UTC
Resolved
Dec 26, 2025, 04:13 PM UTC
Duration
16d 16h
Detected by Pingoru
Dec 10, 2025, 12:00 AM UTC

Affected components

Integrations

Update timeline

  1. monitoring Dec 24, 2025, 02:06 PM UTC

    All events routed to the Mailchimp cloud-mode destination for starter and growth customers in US region are failing consistently.

  2. monitoring Dec 24, 2025, 02:09 PM UTC

    We identified that RudderStack IPs are being blocked by Mailchimp’s Akamai proxy. We are working to establish an active communication channel with Mailchimp’s team to resolve this issue.

  3. monitoring Dec 24, 2025, 02:09 PM UTC

    We resolved the issue for free tier customers. We are waiting on Mailchimp to establish an active communication channel to unblock our IPs for complete resolution.

  4. resolved Dec 26, 2025, 04:13 PM UTC

    We have identified and isolated events causing Mailchimp and Akamai flagging our public IP for some of our customers. Necessary steps have been taken and issue is resolved now for all customers including free tier users