Reference: https://developers.cloudflare.com/ssl/edge-certificates/custom-certificates/caa-records https://www.namecheap.com/support/knowledgebase/article.aspx/9991/38/caa-record-and-why-it-is-needed-ssl-related/ https://sslmate.com/caa/ https://support.cloudflare.com/hc/en-us/articles/115000310832-Certification-Authority-Authorization-CAA-FAQ https://www.entrust.com/knowledgebase/ssl/how-to-add-a-certification-authority-authorization-caa-record-in-cloudflare