dns.int.pan.wroc.pl has no MX records.
Question and response
Question
dig dns.int.pan.wroc.pl. MX
Answer
The response has no answer records.
Authority
int.pan.wroc.pl. 3600 SOA dns.int.pan.wroc.pl. ci.intibs.pl. 1634236627 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0