ns1.ncdelivery01.com has no MX records.
Question and response
Question
dig ns1.ncdelivery01.com. MX
Answer
The response has no answer records.
Authority
ncdelivery01.com. 86400 SOA ns1.dnsbolt.com. Postmaster.ncdelivery01.com. 643828600 10800 3600 172800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0