mx.headwaylenses.com has no NS records.
NS records for this zone are defined at headwaylenses.com.
NS records for this zone are defined at headwaylenses.com.
Question and response
Question
dig mx.headwaylenses.com. NS
Answer
The response has no answer records.
Authority
headwaylenses.com. 3600 SOA dns.headwaylenses.com. hostmaster.headwaylenses.com. 1295128776 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0