SPF, which is an acronym for Sender Policy Framework, is an email protection system, which is designed to confirm whether an email message is sent by a certified server. Employing SPF protection for a domain name will prevent the faking of emails made with the domain. In layman's terms: enabling this attribute for a domain makes a specific record in the Domain Name System (DNS) that contains the IP of the servers that are allowed to send emails from mailboxes under the domain. When this record propagates worldwide, it exists on all of the DNS servers that direct the Internet traffic. When a new e-mail message is sent, the initial DNS server it goes through tests if it comes from an authorized server. In the event it does, it is sent 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 e-mail address and make it look as if you're sending spam messages. This approach is also referred to as email spoofing.