mx.247features.com has no NS records.
NS records for this zone are defined at 247features.com.
NS records for this zone are defined at 247features.com.
Question and response
Question
dig mx.247features.com. NS
Answer
The response has no answer records.
Authority
247features.com. 3600 SOA dns.247features.com. hostmaster.247features.com. 1737108456 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0