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

Dec 26 , 16:13 UTC Resolved - 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 Dec 24 , 14:09 UTC Update - 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.