SPF, which is short for Sender Policy Framework, is an e-mail security system, which is designed to validate whether an email message is sent by a certified server. Employing SPF protection for a particular domain name will stop the faking of emails created with the domain. In layman's terms: enabling this attribute for a domain name makes a specific record in the Domain Name System (DNS) which contains the IP of the servers that are permitted to send e-mail messages from mailboxes under the domain. The moment this record propagates worldwide, it will exist on all of the DNS servers that direct the Internet traffic. Every time some email message is sent, the first DNS server it uses tests whether it originates from an accredited server. If it does, it is sent to the destination address, yet if it does not originate from a server listed in the SPF record for the domain, it's discarded. Thus nobody will mask an email address then make it look as if you're sending spam messages. This method is also identified as email spoofing.