_spf.brodgar.nl has no MX records.
Question and response
Question
dig _spf.brodgar.nl. MX
Answer
The response has no answer records.
Authority
brodgar.nl. 3600 SOA ns01.brodgar.net. dns.brodgar.net. 2026021601 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0