mx2.SMARTAPE.RU has no CNAME records.
Question and response
Question
dig mx2.SMARTAPE.RU. NS
Answer
The response has no answer records.
Authority
SMARTAPE.RU. 3548 SOA ns3.SMARTAPE.RU. abuse.SMARTAPE.RU. 2013041697 3600 7200 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0