Domains with DNS TXT v=spf1 a include:spf.protection.outlook.com include:mailgun.org include:_spf.google.com a:smtp-cluster.echointernet.net -all
There is 1 domain that have DNS TXT set to v=spf1 a include:spf.protection.outlook.com include:mailgun.org include:_spf.google.com a:smtp-cluster.echointernet.net -all.