SPF, which is an acronym for Sender Policy Framework, is an e-mail protection system, which is employed to confirm whether an e-mail message was sent by a licensed server. Employing SPF protection for a domain will stop the counterfeiting of email addresses created with the domain. In simple words: enabling this attribute for a domain name creates a particular record in the Domain Name System (DNS) which includes the IP addresses of the servers that are permitted to send e-mails from mail boxes using the domain. When this record propagates globally, it exists on all the DNS servers that direct the Internet traffic. Every time a new email message is sent, the first DNS server it uses verifies if it originates from an accredited server. When it does, it's sent to the destination address, however when it does not originate from a server listed in the SPF record for the particular domain, it's discarded. Thus nobody can mask an e-mail address then make it appear as if you're distributing spam. This technique is also identified as email spoofing.