bsnlinmx.dildns.com has no CNAME records.
Question and response
Question
dig bsnlinmx.dildns.com. NS
Answer
The response has no answer records.
Authority
dildns.com. 3181 SOA ns1.dildns.com. shailesh.dil.in. 2016090700 3600 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0