mx.linkeddevelop.com has no NS records.
NS records for this zone are defined at linkeddevelop.com.
NS records for this zone are defined at linkeddevelop.com.
Question and response
Question
dig mx.linkeddevelop.com. NS
Answer
The response has no answer records.
Authority
linkeddevelop.com. 3600 SOA dns.linkeddevelop.com. hostmaster.linkeddevelop.com. 1114174736 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0