mx5.rt-solar.ru has no MX records.
Question and response
Question
dig mx5.rt-solar.ru. MX
Answer
The response has no answer records.
Authority
rt-solar.ru. 293 SOA ns1.selectel.ru. support.selectel.ru. 2023060256 10800 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0