nss2.sovamua.com has no MX records.
Question and response
Question
dig nss2.sovamua.com. MX
Answer
The response has no answer records.
Authority
sovamua.com. 43200 SOA ns.sovamua.com. domaintech.kiev.sovam.com. 2021040201 28800 3600 604800 86400
Additional
. 0 OPT [{Extended_DNS_Error: PROHIBITED}] ; payload 1232, xrcode 0, version 0, flags 0