SPF, which is an acronym for Sender Policy Framework, is an e-mail safety system, that is employed to verify if an e-mail message was sent by an authorized server. Using SPF protection for a particular domain name will stop the faking of emails created with the domain. In layman's terms: enabling this function for a domain name makes a specific record in the Domain Name System (DNS) which includes the IP addresses of the servers that are allowed to send emails from mail boxes under the domain. When this record propagates globally, it will exist on all the DNS servers that direct the Internet traffic. When an e-mail message is sent, the initial DNS server it goes through checks whether it comes from an accredited server. In the event it does, it is forwarded to the destination address, but when it does not originate from a server listed in the SPF record for the particular domain, it is discarded. In this way nobody can mask an email address to make it look as if you're e-mailing spam messages. This approach is also termed email spoofing.