mx.danuta.org has no NS records.
NS records for this zone are defined at danuta.org.
NS records for this zone are defined at danuta.org.
Question and response
Question
dig mx.danuta.org. NS
Answer
The response has no answer records.
Authority
danuta.org. 3600 SOA dns.danuta.org. hostmaster.danuta.org. 1962196204 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0