SPF, which is an acronym for Sender Policy Framework, is an email protection 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 stop the counterfeiting of email addresses made with the domain. In simple words: enabling this attribute for a domain generates a special record in the Domain Name System (DNS) which includes the IP addresses of the servers that are allowed to send e-mail messages from mail boxes using the domain. When this record propagates globally, it exists on all the DNS servers that route the Internet traffic. Whenever some email message is sent, the first DNS server it uses tests whether it comes from an accredited server. If it does, it's forwarded to the destination address, yet when it doesn't originate from a server part of the SPF record for the domain, it's discarded. Thus nobody can mask an e-mail address then make it appear as if you are distributing spam. This approach is also referred to as email spoofing.