mx.arishiny.com has no NS records.
NS records for this zone are defined at arishiny.com.
NS records for this zone are defined at arishiny.com.
Question and response
Question
dig mx.arishiny.com. NS
Answer
The response has no answer records.
Authority
arishiny.com. 3600 SOA dns.arishiny.com. hostmaster.arishiny.com. 1173657892 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0