mx4.casjaydns.com has no MX records.
Question and response
Question
dig mx4.casjaydns.com. MX
Answer
The response has no answer records.
Authority
casjaydns.com. 38400 SOA dns.casjaydns.com. dns-admin.casjaydns.com. 2026010272 10800 3600 1209600 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0