mx.yus.legal has no MX records.
Question and response
Question
dig mx.yus.legal. MX
Answer
The response has no answer records.
Authority
yus.legal. 3600 SOA isp4.wm.ru. dnsmaster.wm.ru. 2019022856 3600 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0