kushnir.sileman.pl has no MX records.
Question and response
Question
dig kushnir.sileman.pl. MX
Answer
The response has no answer records.
Authority
sileman.pl. 10800 SOA ns5.sileman.pl. ip.sileman.pl. 2025121501 3600 900 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0