SPF, which is short for Sender Policy Framework, is an e-mail safety system, which is used to verify if an email message is sent by an official server. Using SPF protection for a domain name will stop the faking of email addresses generated with the domain. In layman's terms: enabling this function for a domain name creates a specific record in the Domain Name System (DNS) that contains the IP addresses of the servers which are permitted to send e-mails from mailboxes using the domain. The moment this record propagates globally, it will exist on all the DNS servers that route the Internet traffic. Whenever a new e-mail message is sent, the initial DNS server it uses tests whether it originates from an accredited server. If it does, it is forwarded to the destination address, yet if it does not originate from a server part of the SPF record for the domain, it is discarded. Thus nobody will mask an email address then make it appear as if you are e-mailing spam. This method is also termed email spoofing.