sabat.tu.kielce.pl has no MX records.
Question and response
Question
dig sabat.tu.kielce.pl. MX
Answer
The response has no answer records.
Authority
tu.kielce.pl. 1800 SOA dns.kielce.pl. root.eden.tu.kielce.pl. 2026030501 7200 1800 1209600 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0