mx4.casjay.gdn has no CNAME records.
Question and response
Question
dig mx4.casjay.gdn. NS
Answer
The response has no answer records.
Authority
casjay.gdn. 4785 SOA dns.casjay.gdn. dns-admin.casjay.gdn. 2026010370 10800 3600 1209600 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0