mail-vm.samaralan.ru has no CNAME records.
Question and response
Question
dig mail-vm.samaralan.ru. NS
Answer
The response has no answer records.
Authority
SAMARALAN.RU. 1945 SOA ns1.SAMARALAN.RU. dav.ns1.SAMARALAN.RU. 2025111101 3600 60 200000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0