mbacgroup.entregaemail.com has no CNAME records.
Question and response
Question
dig mbacgroup.entregaemail.com. NS
Answer
The response has no answer records.
Authority
entregaemail.com. 324 SOA kim.ns.cloudflare.com. dns.cloudflare.com. 2398035836 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0