ipv4.elbonet.pl has no MX records.
Question and response
Question
dig ipv4.elbonet.pl. MX
Answer
The response has no answer records.
Authority
ipv4.elbonet.pl. 86400 SOA ns3.elbonet.pl. hostmaster.elbonet.pl. 2025040800 3600 1800 172800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0