spf.skole.hr has no MX records.
Question and response
Question
dig spf.skole.hr. MX
Answer
The response has no answer records.
Authority
skole.hr. 2560 SOA ns1.skole.hr. root.skole.hr. 2026022406 16384 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0