mail.VLAD.RU has no CNAME records.
Question and response
Question
dig mail.VLAD.RU. NS
Answer
The response has no answer records.
Authority
vlad.ru. 4691 SOA ns.vmts.ru. dnsmaster.vmts.ru. 2025012001 86400 7200 1468800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0