ns4.eurobyte.ru has no MX records.
Question and response
Question
dig ns4.eurobyte.ru. MX
Answer
The response has no answer records.
Authority
eurobyte.ru. 3600 SOA dns1.eurobyte.ru. info.eurobyte.ru. 2018101201 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0