SPF, which abbreviates Sender Policy Framework, is a verification system that aims at protecting against the so-called e-mail forging. Essentially, this indicates sending a message from one e-mail address and making it look like it’s sent from a different one with the purpose to scam in some way the individual receiving it. If the SPF protection is running for a domain name, a record that contains all of the mail servers authorized to send messages with addresses in the domain is generated. The record is placed on all the DNS servers that direct the web traffic internationally, therefore they all will recognize if an e-mail message comes from a legitimate server or not. The check is conducted at the very first server where the email goes through and in the first case the e-mail message is forwarded, and in the second one it is discarded and it never gets to its intended recipient. Employing SPF records for your domain names will prevent all unauthorized people from making use of your emails for malicious objectives.