mcn-mail.MOSCOMNET.RU has no CNAME records.
Question and response
Question
dig mcn-mail.MOSCOMNET.RU. NS
Answer
The response has no answer records.
Authority
moscomnet.ru. 2441 SOA ns1.moscomnet.ru. tech.moscomnet.ru. 2020111823 10800 3600 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0