SPF, which is an acronym for Sender Policy Framework, is an e-mail safety system, which is employed to confirm if an e-mail message was sent by a licensed server. Employing SPF protection for a domain will prevent the counterfeiting of emails generated with the domain. In simple words: activating this feature for a domain name creates a specific record in the Domain Name System (DNS) that contains the IP of the servers which are permitted to send e-mail messages from mailboxes using the domain. As soon as this record propagates globally, it exists on all the DNS servers that direct the Internet traffic. When an email message is sent, the first DNS server it goes through checks if it originates from an accredited server. When it does, it's sent to the destination address, yet if it doesn't come from a server part of the SPF record for the domain, it is discarded. In this way nobody will be able to mask an email address to make it look as if you are distributing spam messages. This method is also known as email spoofing.