Hi Jay, Hope you are doing well. Please raise a case through DevCare Portal where our team can assist you. If you have not joined yet, click here: https://developer.cdkcare.com/ While posting each email id has a limit, Once the limit is crossed generally this error comes. While testing many of our partners are using the default template from the APi specification which is why max limit reached for an email id. Please be sure to send unique data while posting. For further discussion please create a case in DevCare portal as mentioned above, Fortellis Engagement Office team will assist you further regarding the issue and its resolution. Thank you.