mail.dwhost.net has no CNAME records.
Question and response
Question
dig mail.dwhost.net. NS
Answer
The response has no answer records.
Authority
dwhost.net. 5400 SOA dns1.dwhost.net. admin.dreamweb.rs. 2026022602 21600 7200 1814400 5400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0