net.sub0.net78.udm.net has no MX records.
Question and response
Question
dig net.sub0.net78.udm.net. MX
Answer
The response has no answer records.
Authority
udm.net. 3600 SOA a.ns.udmvt.ru. hostmaster.udm.net. 2025112601 86400 7200 4838400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0