imail.itmh.ru has no CNAME records.
Question and response
Question
dig imail.itmh.ru. NS
Answer
The response has no answer records.
Authority
itmh.ru. 600 SOA ns0.mirasystem.net. admins.mirasystem.net. 2023041701 3600 600 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0