mx2.OBIT.RU has no CNAME records.
Question and response
Question
dig mx2.OBIT.RU. NS
Answer
The response has no answer records.
Authority
OBIT.RU. 2357 SOA dns1.OBIT.RU. dns.OBIT.RU. 2026022201 3600 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0