mx.hostcentric.net has no CNAME records.
Question and response
Question
dig mx.hostcentric.net. NS
Answer
The response has no answer records.
Authority
hostcentric.net. 3 SOA ns.web2010.com. root.web2010.com. 2005053101 10800 3600 604800 10
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0