_noc.inoc.net has no MX records.
Question and response
Question
dig _noc.inoc.net. MX
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 4096, xrcode 0, version 0, flags 0