Our data indicates RealHosting supports DMARC compliance via SPF.
Contact RealHosting to understand more about their DKIM capabilities.
RealHosting has provided the following include - 'include:spf.spamservice.nl'. However please note this pulls in a lot of authorizations; our recommendation is to contact RealHosting and verify all of them are needed and/or their control. More information on RealHosting's SPF setup can be found here: https://realhosting.nl/helpdesk/welk-spf-record-moet-ik-gebruiken-bij-een-extern-domein/