smtp2.mailrcld.com has no CNAME records.
Question and response
Question
dig smtp2.mailrcld.com. NS
Answer
The response has no answer records.
Authority
mailrcld.com. 3205 SOA pns31.cloudns.net. support.cloudns.net. 2026021601 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0