Domains with DNS TXT v=spf1 include:spf.protection.outlook.com include:spf.ess.barracudanetworks.com include:mailgun.org -all

There are 49 domains that have DNS TXT set to v=spf1 include:spf.protection.outlook.com include:spf.ess.barracudanetworks.com include:mailgun.org -all. The top 49 records ordered by domain rank are listed below.