SPF, which abbreviates Sender Policy Framework, is an authentication system that is aimed at blocking the so-called e-mail faking. Essentially, this indicates sending a message from one e-mail and making it look like it’s sent from another with the objective to scam in some manner the person receiving it. If the SPF protection is activated for a domain name, a record that includes all of the mail servers authorized to email messages with addresses under the domain is generated. The record is saved on all of the DNS servers that direct the web traffic all over the world, therefore they all can recognize if an email message comes from a valid server or not. The verification is done at the first server where the e-mail goes through and in the first case the email message is forwarded, while in the second one it's removed and it never reaches the intended recipient. Employing SPF records for your domains will stop all unauthorized people from making use of your email addresses for harmful objectives.