poczta.fl.netia.pl has no MX records.
Question and response
Question
dig poczta.fl.netia.pl. MX
Answer
The response has no answer records.
Authority
fl.netia.pl. 86400 SOA ns1.futuro.pl. dns.netia.pl. 2018092205 10800 1800 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0