rudc.cloud has no MX records.
Question and response
Question
dig rudc.cloud. MX
Answer
The response has no answer records.
Authority
rudc.cloud. 86400 SOA alpha.atlex.ru. noc.atlex.ru. 2026022001 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0