cp.wifi.pakt.ru has no MX records.
Question and response
Question
dig cp.hot-wifi.ru. MX
Answer
The response has no answer records.
Authority
hot-wifi.ru. 600 SOA ns1.masterhost.ru. hostmaster.masterhost.ru. 1769771265 28800 7200 1209600 600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0