SPF, which is an acronym for Sender Policy Framework, is an e-mail safety system, that is used to confirm whether an e-mail message is sent by an official server. Using SPF protection for a domain will prevent the forging of email addresses made with the domain. In layman's terms: enabling this attribute for a domain name generates a specific record in the Domain Name System (DNS) which includes the IP of the servers which are allowed to send emails from mail boxes using the domain. When this record propagates worldwide, it exists on all DNS servers that route the Internet traffic. When some e-mail message is sent, the initial DNS server it uses verifies whether it comes from an authorized server. If it does, it is sent to the destination address, yet when it does not originate from a server part of the SPF record for the particular domain, it is discarded. In this way nobody will be able to mask an email address then make it look as if you are distributing spam. This method is also identified as email spoofing.