webmail.luxsci.com has no NS records.
NS records for this zone are defined at luxsci.com.
NS records for this zone are defined at luxsci.com.
Question and response
Question
dig webmail.luxsci.com. NS
Answer
The response has no answer records.
Authority
luxsci.com. 300 SOA dns1.easydns.com. zone.easydns.com. 1771813406 43200 10800 1857600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0