m1.mail-core-2.beget.ru has no MX records.
Question and response
Question
dig m1.mail-core-2.beget.ru. MX
Answer
The response has no answer records.
Authority
beget.ru. 300 SOA ns1.beget.com. hostmaster.beget.com. 1772634573 300 600 86400 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0