mx.rottfireheart.com has no NS records.
NS records for this zone are defined at rottfireheart.com.
NS records for this zone are defined at rottfireheart.com.
Question and response
Question
dig mx.rottfireheart.com. NS
Answer
The response has no answer records.
Authority
rottfireheart.com. 3600 SOA dns.rottfireheart.com. hostmaster.rottfireheart.com. 1515112833 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0