mail.des.net.id has no CNAME records.
Question and response
Question
dig mail.des.net.id. NS
Answer
The response has no answer records.
Authority
des.net.id. 1000 SOA hosting.ptdes.net. hostmaster.des.net.id. 2025082502 1800 3600 1209680 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0