SPF, which is an acronym for Sender Policy Framework, is an email safety system, that is employed to confirm whether an email message was sent by an official server. Employing SPF protection for a domain will stop the counterfeiting of emails generated with the domain. In simple words: activating this attribute for a domain generates a particular record in the Domain Name System (DNS) that contains the IP addresses of the servers that are permitted to send emails from mailboxes using the domain. Once this record propagates worldwide, it exists on all DNS servers that route the Internet traffic. Any time a new e-mail message is sent, the initial DNS server it goes through tests whether it comes from an approved server. When it does, it is sent to the destination address, yet when it does not come from a server part of the SPF record for the domain, it is rejected. Thus nobody can mask an email address then make it appear as if you're e-mailing spam messages. This method is also known as email spoofing.