mailgw03.bocigroup.com has no CNAME records.
Question and response
Question
dig mailgw03.bocigroup.com. NS
Answer
The response has no answer records.
Authority
bocigroup.com. 648 SOA ns15.imsbiz.com. dnsadmin.imsbiz.com. 2025120401 10800 3600 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0