mx.0442991281.com has no CNAME records.
Question and response
Question
dig mx.0442991281.com. NS
Answer
The response has no answer records.
Authority
0442991281.com. 3433 SOA dns.0442991281.com. hostmaster.0442991281.com. 1486761574 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0