mx1-sces.sorbsecurity.com has no CNAME records.
Question and response
Question
dig mx1-sces.sorbsecurity.com. NS
Answer
The response has no answer records.
Authority
sorbsecurity.com. 6 SOA ns01.sorbsecurity.com. admin.sorbsecurity.com. 2023051801 3600 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0