SPF, which means Sender Policy Framework, is an e-mail safety system, which is employed to confirm if an email message was sent by an official server. Employing SPF protection for a domain name will stop the faking of emails made with the domain. In layman's terms: activating this feature for a domain name creates a special record in the Domain Name System (DNS) containing the IP of the servers which are permitted to send email messages from mail boxes under the domain. The moment this record propagates worldwide, it will exist on all DNS servers that direct the Internet traffic. Whenever an e-mail message is sent, the initial DNS server it uses checks whether it comes from an official server. If it does, it is forwarded to the destination address, but if 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 distributing spam messages. This approach is also known as email spoofing.