mx0.netangels.RU has no CNAME records.
Question and response
Question
dig mx0.netangels.RU. NS
Answer
The response has no answer records.
Authority
netangels.RU. 126 SOA ns1.netangels.RU. hostmaster.netangels.RU. 1772480602 3600 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0