_spf-v4.melbicom.net has no MX records.
Question and response
Question
dig _spf-v4.melbicom.net. MX
Answer
The response has no answer records.
Authority
melbicom.net. 300 SOA dns1.swiftycdn.net. ncc.melbicom.net. 2012123329 7200 2400 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0