Domains with DNS TXT v=spf1 include:spf.protection.outlook.com include:sendgrid.net include:relay.mailchannels.net -all

There are 66 domains that have DNS TXT set to v=spf1 include:spf.protection.outlook.com include:sendgrid.net include:relay.mailchannels.net -all. The top 50 records ordered by domain rank are listed below.