ns2.risebroadband.com has no MX records.
Question and response
Question
dig ns2.risebroadband.com. MX
Answer
The response has no answer records.
Authority
ns2.risebroadband.com. 14400 SOA ns1.risebroadband.com. svralerts.skybeam.com. 2017051601 14400 7200 2419200 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0