mx.beyond.pl has no NS records.
NS records for this zone are defined at beyond.pl.
NS records for this zone are defined at beyond.pl.
Question and response
Question
dig mx.beyond.pl. NS
Answer
The response has no answer records.
Authority
beyond.pl. 21600 SOA ns1.beyond.pl. hostmaster.beyond.pl. 2026021701 3600 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0