swiftycdn.net has no MX records.
Question and response
Question
dig swiftycdn.net. MX
Answer
The response has no answer records.
Authority
swiftycdn.net. 60 SOA dns1.swiftycdn.net. ncc.melbicom.net. 2012121209 10800 2400 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0