ns2.hosting.orange.pl has no MX records.
Question and response
Question
dig ns2.hosting.orange.pl. MX
Answer
The response has no answer records.
Authority
hosting.orange.pl. 3600 SOA ns1.hosting.orange.pl. dns.hosting.orange.pl. 1770429998 172800 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0