list.domru.ru has no MX records.
Question and response
Question
dig list.domru.ru. MX
Answer
The response has no answer records.
Authority
domru.ru. 3600 SOA ns6.ertelecom.ru. noc.ertelecom.ru. 2026020201 86400 1800 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0