mx.pirxnet.pl has no MX records.
Question and response
Question
dig mx.pirxnet.pl. MX
Answer
The response has no answer records.
Authority
pirxnet.pl. 86400 SOA max.digi.pl. hostmaster.pirxnet.pl. 2024110502 21600 7200 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0