SPF, which stands for Sender Policy Framework, is an email safety system, which is employed to confirm if an e-mail message is sent by a certified server. Employing SPF protection for a domain name will prevent the counterfeiting of emails generated with the domain. In simple words: enabling this attribute for a domain name generates a special record in the Domain Name System (DNS) which contains the IP addresses of the servers which 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 route the Internet traffic. Every time a new e-mail message is sent, the initial DNS server it uses verifies if it comes from an accredited server. If it does, it is sent to the destination address, but if it does not come from a server part of the SPF record for the particular domain, it is rejected. Thus nobody will mask an e-mail address then make it look as if you're e-mailing spam messages. This technique is also called email spoofing.