173.244.209.184.static.midphase.com has no MX records.
Question and response
Question
dig 173.244.209.184.static.midphase.com. MX
Answer
The response has no answer records.
Authority
midphase.com. 3600 SOA dns1.p01.nsone.net. hostmaster.nsone.net. 1731081753 43200 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0