spf.bluem.nl has no MX records.
Question and response
Question
dig spf.bluem.nl. MX
Answer
The response has no answer records.
Authority
bluem.nl. 3600 SOA dns0.domeinbalie.nl. service.domeinbalie.nl. 2026022006 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0