mx4.v101.vh.net.pl has no MX records.
Question and response
Question
dig mx4.v101.vh.net.pl. MX
Answer
The response has no answer records.
Authority
vh.net.pl. 86400 SOA ns1.domenomania.pl. mm.wdma.pl. 2025071400 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0