_block1.primorye.ru has no MX records.
Question and response
Question
dig _block1.primorye.ru. MX
Answer
The response has no answer records.
Authority
primorye.ru. 3600 SOA ns1.pk.ru. root.ip.rostelecom.ru. 2025110201 86400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0