mx.handyhost.ru has no NS records.
NS records for this zone are defined at handyhost.ru.
NS records for this zone are defined at handyhost.ru.
Question and response
Question
dig mx.handyhost.ru. NS
Answer
The response has no answer records.
Authority
handyhost.ru. 3600 SOA scruffy.handyhost.ru. root.handyhost.ru. 2019101655 3600 3600 604800 86400
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0