mail224.dopplermta9.com has no CNAME records.
Question and response
Question
dig mail224.dopplermta9.com. NS
Answer
The response has no answer records.
Authority
dopplermta9.com. 393 SOA pdns13.domaincontrol.com. dns.jomax.net. 2025121704 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0