mx.ncweb01.com has no CNAME records.
Question and response
Question
dig mx.ncweb01.com. NS
Answer
The response has no answer records.
Authority
ncweb01.com. 5108 SOA ns1.ncweb01.com. Postmaster.ncweb01.com. 637818622 10800 3600 172800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0