ns1b.dbsintl.net has no MX records.
Question and response
Question
dig ns1b.dbsintl.net. MX
Answer
The response has no answer records.
Authority
dbsintl.net. 7200 SOA ns1.ral.hostedsolutions.com. hostmaster.hostedsolutions.com. 2013061761 10800 3600 604800 604800
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0