mx.korbank.pl has no MX records.
Question and response
Question
dig mx.korbank.pl. MX
Answer
The response has no answer records.
Authority
korbank.pl. 900 SOA dns.korbank.pl. hostmaster.korbank.pl. 2025091527 900 300 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0