dns2.dnsclusterhost.com has no MX records.
Question and response
Question
dig dns2.dnsclusterhost.com. MX
Answer
The response has no answer records.
Authority
dnsclusterhost.com. 7200 SOA ns-canada.topdns.com. hostmaster.topdns.com. 2022120201 14400 7200 950400 7200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0