mx.saura8.com has no NS records.
NS records for this zone are defined at saura8.com.
NS records for this zone are defined at saura8.com.
Question and response
Question
dig mx.saura8.com. NS
Answer
The response has no answer records.
Authority
saura8.com. 3600 SOA dns.saura8.com. hostmaster.saura8.com. 1144055363 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0