Domains with DNS TXT v=spf1 a:post.email4you.nl include:mailgun.org include:_spf.realworks.nl include:spf.mijnrds.nl -all
There is 1 domain that have DNS TXT set to v=spf1 a:post.email4you.nl include:mailgun.org include:_spf.realworks.nl include:spf.mijnrds.nl -all.