dynamic.spd-mgts.ru has no MX records.
Question and response
Question
dig dynamic.spd-mgts.ru. MX
Answer
The response has no answer records.
Authority
dynamic.spd-mgts.ru. 86400 SOA ns1.spd-mgts.ru. noc.spd-mgts.ru. 2020041400 7200 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0