maildr.bbmg.tech has no CNAME records.
Question and response
Question
dig maildr.bbmg.tech. NS
Answer
The response has no answer records.
Authority
bbmg.tech. 1659 SOA carl.ns.cloudflare.com. dns.cloudflare.com. 2397569698 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0