mail.inoc.net has no CNAME records.
Question and response
Question
dig mail.inoc.net. NS
Answer
The response has no answer records.
Authority
inoc.net. 3600 SOA ns0.inoc.net. hostmaster.inoc.net. 2026020400 3600 900 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0