vnet-prv.vectranet.pl has no MX records.
Question and response
Question
dig vnet-prv.vectranet.pl. MX
Answer
The response has no answer records.
Authority
vectranet.pl. 86400 SOA ns.multimedia.pl. ns.multimedia.pl. 2474 28800 7200 604800 86400
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0