ctsmtp.orange.pl has no NS records.
NS records for this zone are defined at orange.pl.
NS records for this zone are defined at orange.pl.
Question and response
Question
dig ctsmtp.orange.pl. NS
Answer
The response has no answer records.
Authority
orange.pl. 86400 SOA ns1.corpnet.pl. dns-pl.orange.com. 2026030201 172800 21600 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0