master0.cluster.vaultbox.games has no MX records.
Question and response
Question
dig master0.cluster.vaultbox.games. MX
Answer
The response has no answer records.
Authority
vaultbox.games. 1800 SOA elle.ns.cloudflare.com. dns.cloudflare.com. 2397101955 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0