ns1.skybeam.com has no MX records.
Question and response
Question
dig ns1.skybeam.com. MX
Answer
The response has no answer records.
Authority
skybeam.com. 86400 SOA ns1.skybeam.com. noc.skybeam.com. 2015072921 7200 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0