spf.nodea.net.pl has no MX records.
Question and response
Question
dig spf.nodea.net.pl. MX
Answer
The response has no answer records.
Authority
nodea.net.pl. 100 SOA ns1.nodea.pl. hostmaster.nodea.net.pl. 2026022401 100 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0