mx.lucentharbor.com has no NS records.
NS records for this zone are defined at lucentharbor.com.
NS records for this zone are defined at lucentharbor.com.
Question and response
Question
dig mx.lucentharbor.com. NS
Answer
The response has no answer records.
Authority
lucentharbor.com. 3600 SOA dns.lucentharbor.com. hostmaster.lucentharbor.com. 1225970125 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0