perseus.dnsclusterhost.com has no MX records.
Question and response
Question
dig perseus.dnsclusterhost.com. MX
Answer
The response has no answer records.
Authority
dnsclusterhost.com. 86400 SOA dns1.dnsclusterhost.com. administrator.whitelabelitsolutions.com. 2025052802 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0