mx.otenet.gr has no NS records.
NS records for this zone are defined at otenet.gr.
NS records for this zone are defined at otenet.gr.
Question and response
Question
dig mx.otenet.gr. NS
Answer
The response has no answer records.
Authority
otenet.gr. 86400 SOA ns1.otenet.gr. hostmaster.ns1.otenet.gr. 2026021101 10800 3600 1814400 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0