SPF, which means Sender Policy Framework, is an email safety system, which is is intended to confirm whether an e-mail message was sent by a licensed server. Using SPF protection for a particular domain name will stop the faking of emails made with the domain. In layman's terms: activating this function for a domain generates a specific record in the Domain Name System (DNS) which includes the IP of the servers that are allowed to send email messages from mailboxes under the domain. The moment this record propagates globally, it exists on all the DNS servers that route the Internet traffic. Whenever a new email message is sent, the initial DNS server it goes through verifies if it comes from an official server. In the event it does, it is sent to the destination address, however when it does not come from a server part of the SPF record for the particular domain, it is discarded. In this way nobody will mask an e-mail address and make it appear as if you're distributing spam. This approach is also identified as email spoofing.