mx6.melbicom.net has no CNAME records.
Question and response
Question
dig mx6.melbicom.net. NS
Answer
The response has no answer records.
Authority
melbicom.net. 93 SOA dns1.swiftycdn.net. ncc.melbicom.net. 2012123329 7200 2400 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0