poczta.vtelecom.pl has no MX records.
Question and response
Question
dig poczta.vtelecom.pl. MX
Answer
The response has no answer records.
Authority
vtelecom.pl. 3600 SOA ns3.vtelecom.pl.vtelecom.pl. admin.vtelecom.pl. 2025022101 3600 86400 2419200 345600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0