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