mx.redham.ru has no NS records.
NS records for this zone are defined at redham.ru.
NS records for this zone are defined at redham.ru.
Question and response
Question
dig mx.redham.ru. NS
Answer
The response has no answer records.
Authority
redham.ru. 3600 SOA ns1.redham.ru. support.redham.ru. 2022071664 900 600 86400 3600
Additional
. 0 OPT ; payload 2800, xrcode 0, version 0, flags 0