mx.netboundaries.com has no NS records.
NS records for this zone are defined at netboundaries.com.
NS records for this zone are defined at netboundaries.com.
Question and response
Question
dig mx.netboundaries.com. NS
Answer
The response has no answer records.
Authority
netboundaries.com. 3600 SOA dns.netboundaries.com. hostmaster.netboundaries.com. 1461007418 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0