_spf.mijnwefact.nl has no MX records.
Question and response
Question
dig _spf.mijnwefact.nl. MX
Answer
The response has no answer records.
Authority
mijnwefact.nl. 3600 SOA ns1.wefact.nl. hostmaster.mijnwefact.nl. 2026020101 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0