mxs.ux.it-lite.ru has no MX records.
Question and response
Question
dig mxs.ux.it-lite.ru. MX
Answer
The response has no answer records.
Authority
ux.it-lite.ru. 10800 SOA ns1.it-lite.ru. support.it-lite.ru. 2021101935 14400 3600 604800 10800
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0