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

There are 4 domains that have DNS TXT set to v=spf1 include:spf.protection.outlook.com include:mktomail.com include:usb._netblocks.mimecast.com -all. The top 4 records ordered by domain rank are listed below.

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