mx.e2enetworks.net.in has no CNAME records.
Question and response
Question
dig mx.e2enetworks.net.in. NS
Answer
The response has no answer records.
Authority
e2enetworks.net.in. 10800 SOA ns21.e2enetworks.net.in. hostmaster.e2enetworks.com. 1581 86400 15 604800 108000
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0