ns.icm.edu.pl has no MX records.
Question and response
Question
dig ns.icm.edu.pl. MX
Answer
The response has no answer records.
Authority
icm.edu.pl. 36000 SOA ns.icm.edu.pl. hostmaster.icm.edu.pl. 2026012901 7200 900 604800 36000
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0