nssec3.VDSINA.RU has no MX records.
Question and response
Question
dig nssec3.VDSINA.RU. MX
Answer
The response has no answer records.
Authority
VDSINA.RU. 600 SOA nserver1.VDSINA.RU. info.VDSINA.RU. 2013033676 10800 3600 172800 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0