spf.hostido.pl has no MX records.
Question and response
Question
dig spf.hostido.pl. MX
Answer
The response has no answer records.
Authority
hostido.pl. 3600 SOA ns1.hostido.net.pl. admin.hostido.pl. 135 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0