mx.posta.telekom.sk has no NS records.
NS records for this zone are defined at telekom.sk.
NS records for this zone are defined at telekom.sk.
Question and response
Question
dig mx.posta.telekom.sk. NS
Answer
The response has no answer records.
Authority
telekom.sk. 86400 SOA ns.telecom.sk. hostmaster.telecom.sk. 2026030220 28800 3600 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0