ns2.inucn.com has no MX records.
Question and response
Question
dig ns2.inucn.com. MX
Answer
The response has no answer records.
Authority
inucn.com. 300 SOA ns1.inucn.com. syseng.incontact.com. 197911 1200 600 1209600 300
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0