relay.kiev.sovam.com has no MX records.
Question and response
Question
dig relay.kiev.sovam.com. MX
Answer
The response has no answer records.
Authority
kiev.sovam.com. 3600 SOA ns.sovamua.com. domaintech.kiev.sovam.com. 2020010600 14400 3600 604800 3600
Additional
. 0 OPT [{Extended_DNS_Error: PROHIBITED}] ; payload 1232, xrcode 0, version 0, flags 0