Domains with DNS TXT v=spf1 include:usb._netblocks.mimecast.com include:spf.protection.outlook.com -all

There are 1,047 domains that have DNS TXT set to v=spf1 include:usb._netblocks.mimecast.com include:spf.protection.outlook.com -all. The top 50 records ordered by domain rank are listed below.