SPF, which is short for Sender Policy Framework, is an e-mail safety system, which is designed to confirm if an e-mail message was sent by an official server. Employing SPF protection for a particular domain name will stop the counterfeiting of emails made with the domain. In layman's terms: activating this attribute for a domain generates a particular record in the Domain Name System (DNS) which includes the IP addresses of the servers that are permitted to send e-mail 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. Any time some email message is sent, the initial DNS server it goes through verifies whether it originates from an approved server. When it does, it is forwarded to the destination address, yet if it does not originate from a server indexed in the SPF record for the domain, it's rejected. Thus nobody will be able to mask an email address then make it look as if you are e-mailing spam messages. This approach is also identified as email spoofing.