ns1.risebroadband.com has no MX records.
Question and response
Question
dig ns1.risebroadband.com. MX
Answer
The response has no answer records.
Authority
ns1.risebroadband.com. 14400 SOA ns1.risebroadband.com. svralerts.skybeam.com. 2017051600 14400 7200 2419200 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0