ns4.bluemilenetworks.com has no MX records.
Question and response
Question
dig ns4.bluemilenetworks.com. MX
Answer
The response has no answer records.
Authority
bluemilenetworks.com. 3600 SOA 76.10.197.30. ipadmin.bluemilenetworks.com. 2015112401 10800 3600 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0