cpbr01.hostzone.net has no MX records.
Question and response
Question
dig cpbr01.hostzone.net. MX
Answer
The response has no answer records.
Authority
hostzone.net. 1800 SOA gwen.ns.cloudflare.com. dns.cloudflare.com. 2393931232 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0