smtp.blacklabelmag.com has no CNAME records.
Question and response
Question
dig smtp.blacklabelmag.com. NS
Answer
The response has no answer records.
Authority
blacklabelmag.com. 2042 SOA ns1.way3.com. dnsadmin.way3.com. 2025081814 3600 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0