mx.inbox.eu has no NS records.
NS records for this zone are defined at inbox.eu.
NS records for this zone are defined at inbox.eu.
Question and response
Question
dig mx.inbox.eu. NS
Answer
The response has no answer records.
Authority
inbox.eu. 86400 SOA ns1.inbokss.com. support.inbox.eu. 2026031101 172800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0