autodiscover.avantel.ru has no NS records.
NS records for this zone are defined at avantel.ru.
NS records for this zone are defined at avantel.ru.
Question and response
Question
dig mail.domru.ru. NS
Answer
The response has no answer records.
Authority
domru.ru. 3600 SOA ns6.ertelecom.ru. noc.ertelecom.ru. 2026032001 86400 1800 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0