mx.ikp.pl has no MX records.
Question and response
Question
dig mx.ikp.pl. MX
Answer
The response has no answer records.
Authority
ikp.pl. 3600 SOA ns1.ikp.pl. hostmaster.ikp.pl. 2025061100 21600 3600 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0