Sender Policy Framework, or SPF, is a validation system, that is used to stop the so-called e-mail spoofing where an email message can be sent from one e-mail, but to appear as being sent from a different, ordinarily with the idea to fraud the recipient for some reason. If SPF protection is enabled for a domain name, a specific record is made for it in the Domain Name System and all the DNS servers around the world receive it. The record features all of the email servers that are permitted to send valid messages from an address part of the domain. When an email is sent, the first DNS server it goes to verifies the SPF record and if the sending server is permitted, the message is sent to the targeted destination. When, however, the sending server is not present in the SPF record for the specified domain, the email message won't be sent and it'll be removed. When you employ this service, it'll stop third parties from sending spam emails which look as if they have been sent from you.