secure01.sendmail.dk has no NS records.
NS records for this zone are defined at sendmail.dk.
NS records for this zone are defined at sendmail.dk.
Question and response
Question
dig secure01.sendmail.dk. NS
Answer
The response has no answer records.
Authority
sendmail.dk. 3600 SOA ns1.dns-sec.dk. admin.dns-sec.dk. 2024070804 900 1200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0