SPF, which is an acronym for Sender Policy Framework, is an email protection system, which is employed to confirm if an email message is sent by an official server. Employing SPF protection for a given domain will stop the faking of emails created with the domain. In simple words: activating this function for a domain generates a particular record in the Domain Name System (DNS) which includes the IP addresses of the servers which are permitted to send e-mails from mailboxes using the domain. Once this record propagates worldwide, it will exist on all the DNS servers that route the Internet traffic. When some e-mail message is sent, the initial DNS server it uses checks whether it originates from an approved server. In the event 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 is rejected. In this way nobody will be able to mask an email address then make it appear as if you are e-mailing spam messages. This approach is also known as email spoofing.