SPF, which means Sender Policy Framework, is an e-mail safety system, which is designed to validate if an email message is sent by a certified server. Using SPF protection for a given domain name will stop the forging of emails made with the domain. In simple words: enabling this attribute 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 under the domain. Once this record propagates worldwide, it exists on all of the DNS servers that direct the Internet traffic. When some email message is sent, the first DNS server it goes through tests whether it originates from an official server. If it does, it's sent to the destination address, yet when it does not come from a server listed in the SPF record for the domain, it is rejected. Thus nobody will mask an email address and make it appear as if you're e-mailing spam. This approach is also identified as email spoofing.