SPF, which is an abbreviation for Sender Policy Framework, is a validation system that aims at stopping the so-called e-mail faking. In simple terms, it indicates sending some message from one email and making it appear to be sent from another one with the purpose to scam in some manner the person receiving it. In the event that the SPF protection is activated for a domain name, a record which includes all of the mail servers authorized to send messages with addresses within the domain is created. The record is stored on all the DNS servers that route the web traffic worldwide, therefore they all will identify if an email message originates from a legitimate server or not. The check is done at the very first server where the email goes through and in the first case the message is forwarded, whereas in the second one it's discarded and it never reaches the intended recipient. Employing SPF records for your domains will prevent any unauthorized people from making use of your email addresses for harmful objectives.