mail.prof-ohrana.ru has no MX records.
Question and response
Question
dig mail.prof-ohrana.ru. MX
Answer
The response has no answer records.
Authority
prof-ohrana.ru. 600 SOA ns1.spaceweb.ru. dns1.sweb.ru. 2012012735 28800 7200 604800 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0