mx2.melbicom.net has no MX records.
Question and response
Question
dig mx2.melbicom.net. MX
Answer
The response has no answer records.
Authority
melbicom.net. 300 SOA dns1.swiftycdn.net. ncc.melbicom.net. 2012123321 7200 2400 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0