smtp.agh.edu.pl has no MX records.
Question and response
Question
dig smtp.agh.edu.pl. MX
Answer
The response has no answer records.
Authority
agh.edu.pl. 3600 SOA ns1.agh.edu.pl. hostmaster.uci.agh.edu.pl. 202602240 86400 7200 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0