mx.whitelabelserver.nl has no NS records.
NS records for this zone are defined at whitelabelserver.nl.
NS records for this zone are defined at whitelabelserver.nl.
Question and response
Question
dig mx.whitelabelserver.nl. NS
Answer
The response has no answer records.
Authority
whitelabelserver.nl. 3600 SOA ns1.whitelabelserver.nl. hostmaster.whitelabelserver.nl. 2026021200 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0