mx2.mcntt.ru has no CNAME records.
Question and response
Question
dig mx2.mcntt.ru. NS
Answer
The response has no answer records.
Authority
mcntt.ru. 1060 SOA ns.ntt.ru. noc.mcntt.ru. 20070818 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0