wroc.pl has no MX records.
Question and response
Question
dig wroc.pl. MX
Answer
The response has no answer records.
Authority
wroc.pl. 86400 SOA wask.wask.wroc.pl. admin.wask.wroc.pl. 2026022001 43200 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0