mx.elsat.net.pl has no MX records.
Question and response
Question
dig mx.elsat.net.pl. MX
Answer
The response has no answer records.
Authority
elsat.net.pl. 60 SOA dns10.ovh.net. tech.ovh.net. 2025093001 86400 3600 3600000 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0