mail.cp247.net has no CNAME records.
Question and response
Question
dig mail.cp247.net. NS
Answer
The response has no answer records.
Authority
cp247.net. 2560 SOA a.ns.ns247.net. hostmaster.cp247.net. 2026020500 16384 2048 1048576 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0