mail.ATMOSPHERICA.RU has no CNAME records.
Question and response
Question
dig mail.ATMOSPHERICA.RU. NS
Answer
The response has no answer records.
Authority
ATMOSPHERICA.RU. 600 SOA ns1.masterhost.RU. hostmaster.masterhost.RU. 1769785077 28800 7200 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0