cpsp02.volare.host has no MX records.
Question and response
Question
dig cpsp02.volare.host. MX
Answer
The response has no answer records.
Authority
volare.host. 1800 SOA curt.ns.cloudflare.com. dns.cloudflare.com. 2396979869 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0