outmx10.umusmsg.com has no MX records.
Question and response
Question
dig outmx10.umusmsg.com. MX
Answer
The response has no answer records.
Authority
outmx10.umusmsg.com. 300 SOA ns1.selectel.ru. support.selectel.ru. 2022041767 10800 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0