mx0.nsoc-obiane.com has no CNAME records.
Question and response
Question
dig mx0.nsoc-obiane.com. NS
Answer
The response has no answer records.
Authority
nsoc-obiane.com. 3600 SOA ns0.nsoc-obiane.com. contact-ns.nsoc-obiane.com. 2026012101 1200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0