www.eserver.ru has no MX records.
Question and response
Question
dig www.eserver.ru. MX
Answer
The response has no answer records.
Authority
eserver.ru. 1800 SOA ns1.ru.eserver.net. hostmaster.eserver.net. 1753819781 7200 3600 604800 1800
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0