SPF, which is an acronym for Sender Policy Framework, is an e-mail security system, which is used to validate if an email message is sent by an authorized server. Employing SPF protection for a particular domain name will stop the counterfeiting of email addresses 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 includes the IP addresses of the servers that are allowed to send email messages from mail boxes using the domain. The moment this record propagates worldwide, it will exist on all DNS servers that direct the Internet traffic. Whenever some e-mail message is sent, the first DNS server it uses verifies whether it originates from an accredited server. If it does, it is forwarded to the destination address, yet if it doesn't come from a server indexed in the SPF record for the domain, it is rejected. Thus nobody will mask an e-mail address then make it appear as if you are distributing spam. This approach is also termed email spoofing.