smtp-bulk.mailpoint.cz has no NS records.
NS records for this zone are defined at mailpoint.cz.
NS records for this zone are defined at mailpoint.cz.
Question and response
Question
dig smtp-bulk.mailpoint.cz. NS
Answer
The response has no answer records.
Authority
mailpoint.cz. 2560 SOA ns.cybersales.cz. hostmaster.cybersales.cz. 1774483416 16384 1800 1048576 2560
Additional
The response has no additional records.