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