bh1.mailserv.in has no CNAME records.
Question and response
Question
dig bh1.mailserv.in. NS
Answer
The response has no answer records.
Authority
mailserv.in. 3194 SOA ns1.netcore.co.in. Postmaster.netcore.co.in. 641688491 10802 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0