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

There are 16 domains that have DNS TXT set to v=spf1 include:spf.protection.outlook.com include:spf.sendinblue.com include:mailgun.org -all. The top 16 records ordered by domain rank are listed below.