ip11.sub17.equant.ru has no MX records.
Question and response
Question
dig ip11.sub17.equant.ru. MX
Answer
The response has no answer records.
Authority
equant.ru. 3600 SOA master.rosprint.net. dnsmaster.rosprint.net. 2021082701 28800 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0