mx2.mizzox.com has no MX records.
Question and response
Question
dig mx2.mizzox.com. MX
Answer
The response has no answer records.
Authority
mizzox.com. 1800 SOA jamie.ns.cloudflare.com. dns.cloudflare.com. 2394979109 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0