mail.naamserver.net has no CNAME records.
Question and response
Question
dig mail.naamserver.net. NS
Answer
The response has no answer records.
Authority
naamserver.net. 10798 SOA ns.naamserver.net. hostmaster.naamserver.net. 2021102103 14400 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0