Customer with IronPort has issue sending email to our domain with non-deliverable report: DNS Soft Error looking up MX asking recursive_nameserver1.parent
Similar issue here if you search reddit for Issues with Cisco DNS Resolution Causing Mail Delivery Problems
Something with non RFC compliant response and cookies. Basically one of our customers that uses ironport and when sending email to us they get the non-deliverable report: DNS Soft Error looking up MX asking recursive_nameserver1.parent
Only started after moving dns to cloudflare. no issue previously in godaddy.