_spf.mailcampaigns.nl has no MX records.
Question and response
Question
dig _spf.mailcampaigns.nl. MX
Answer
The response has no answer records.
Authority
mailcampaigns.nl. 600 SOA ns1.cloudsrvr.eu. root.www.cloudsrvr.eu. 2026022301 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0