Domains with DNS TXT v=spf1 include:_spf.act-on.net include:spf.protection.outlook.com include:mail.zendesk.com -all

There are 172 domains that have DNS TXT set to v=spf1 include:_spf.act-on.net include:spf.protection.outlook.com include:mail.zendesk.com -all. The top 50 records ordered by domain rank are listed below.