nmail.KMV.RU has no MX records.
Question and response
Question
dig nmail.KMV.RU. MX
Answer
The response has no answer records.
Authority
kmv.ru. 300 SOA ns.kmv.ru. hostmaster.kmv.ru. 2026021200 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0