Domains with DNS TXT v=spf1 +mx +a +ip4:54.154.135.21 +include:spf.protection.outlook.com -all
There are 89 domains that have DNS TXT set to v=spf1 +mx +a +ip4:54.154.135.21 +include:spf.protection.outlook.com -all. The top 50 records ordered by domain rank are listed below.