mx.narroweargear.com has no NS records.
NS records for this zone are defined at narroweargear.com.
NS records for this zone are defined at narroweargear.com.
Question and response
Question
dig mx.narroweargear.com. NS
Answer
The response has no answer records.
Authority
narroweargear.com. 3600 SOA dns.narroweargear.com. hostmaster.narroweargear.com. 1243518472 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0