SPF, which means Sender Policy Framework, is an email protection system, which is employed to verify if an email message is sent by a certified server. Employing SPF protection for a domain name will stop the counterfeiting of emails generated with the domain. In layman's terms: activating this attribute for a domain name creates a specific record in the Domain Name System (DNS) which contains the IP of the servers that are allowed to send emails from mailboxes using the domain. Once this record propagates globally, it will exist on all DNS servers that route the Internet traffic. Whenever some e-mail message is sent, the first DNS server it uses tests whether it originates from an accredited server. If it does, it is sent to the destination address, but when it does not come from a server part of the SPF record for the domain, it is rejected. In this way nobody can mask an e-mail address to make it appear as if you are sending spam messages. This method is also known as email spoofing.