mail.cpdevelopments.com has no CNAME records.
Question and response
Question
dig mail.cpdevelopments.com. NS
Answer
The response has no answer records.
Authority
cpdevelopments.com. 3360 SOA dns31.cloudns.net. admin.online-access.com. 2025060301 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0