rbx107.truehost.cloud has no MX records.
Question and response
Question
dig rbx107.truehost.cloud. MX
Answer
The response has no answer records.
Authority
truehost.cloud. 1800 SOA hugh.ns.cloudflare.com. dns.cloudflare.com. 2398517032 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0