Domains with DNS TXT v=spf1 a mx include:_spf.realworks.nl include:spf.mailserver1.realduo.nl include:spf.provalue.nl -all
There is 1 domain that have DNS TXT set to v=spf1 a mx include:_spf.realworks.nl include:spf.mailserver1.realduo.nl include:spf.provalue.nl -all.