mx.getrave.com has no NS records.
NS records for this zone are defined at getrave.com.
NS records for this zone are defined at getrave.com.
Question and response
Question
dig mx.getrave.com. NS
Answer
The response has no answer records.
Authority
getrave.com. 3600 SOA dns1.p07.nsone.net. hostmaster.nsone.net. 1647776650 3600 600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0