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

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2025-12-10 00:00 UTC · Resolved: 2025-12-26 16:13 UTC · Duration: 17 d
- Updates: 4 · Affected components: Integrations
- [Vendor status page: https://stspg.io/zx4bx7gs020z](https://stspg.io/zx4bx7gs020z)
- [Company: RudderStack](https://rewindex.com/company/rudderstack.md)

## Timeline of updates

- **monitoring** 2025-12-10 00:00 UTC: All events routed to the Mailchimp cloud-mode destination for starter and growth customers in US region are failing consistently.
- **monitoring** 2025-12-15 17:00 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.
- **monitoring** 2025-12-24 14:09 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.
- **resolved** 2025-12-26 16:13 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


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Canonical: https://rewindex.com/company/rudderstack/incidents/84fgjy59frmp · Markdown: https://rewindex.com/company/rudderstack/incidents/84fgjy59frmp.md · JSON: https://rewindex.com/api/v1/companies/rudderstack/incidents/84fgjy59frmp · Generated 2026-10-18T10:26:53.620Z