mail.mlrcd.com has no CNAME records.
Question and response
Question
dig mail.mlrcd.com. NS
Answer
The response has no answer records.
Authority
mlrcd.com. 1644 SOA pns31.cloudns.net. support.cloudns.net. 2026012312 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0