mx.mlrcld.com has no CNAME records.
Question and response
Question
dig mx.mlrcld.com. NS
Answer
The response has no answer records.
Authority
mlrcld.com. 3557 SOA pns31.cloudns.net. support.cloudns.net. 2026011201 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0