ns2.hvdata.net has no MX records.
Question and response
Question
dig ns2.hvdata.net. MX
Answer
The response has no answer records.
Authority
hvdata.net. 300 SOA mrbodnsmaster101.nss.crowncastle.com. hostadmin.crowncastle.com. 2017062218 10800 3600 2419200 300
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0