mail-gw01.astralinux.ru has no NS records.
NS records for this zone are defined at astralinux.ru.
NS records for this zone are defined at astralinux.ru.
Question and response
Question
dig mail-gw01.astralinux.ru. NS
Answer
The response has no answer records.
Authority
astralinux.ru. 3600 SOA ns1.yandexcloud.net. mx.cloud.yandex.net. 1 10800 900 604800 86400
Additional
. 0 OPT ; payload 1024, xrcode 0, version 0, flags 0