webmail.netangels.ru has no CNAME records.
Question and response
Question
dig webmail.netangels.ru. NS
Answer
The response has no answer records.
Authority
netangels.ru. 300 SOA ns1.netangels.ru. hostmaster.netangels.ru. 1772480602 3600 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0