dns1.kielce.pl has no MX records.
Question and response
Question
dig dns1.kielce.pl. MX
Answer
The response has no answer records.
Authority
kielce.pl. 86400 SOA dns.kielce.pl. root.dns.kielce.pl. 2026022300 43200 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0