ns3.mkrovlya.ru has no MX records.
Question and response
Question
dig ns3.mkrovlya.ru. MX
Answer
The response has no answer records.
Authority
mkrovlya.ru. 60 SOA ns3.mkrovlya.ru. root.mkrovlya.ru. 2025030437 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0