SPF, which is an abbreviation for Sender Policy Framework, is an authentication system that is aimed at stopping the so-called email faking. Essentially, this means sending a message from one e-mail address and making it look like it’s sent from a different one with the objective to scam in some manner the person getting it. When the SPF protection is activated for a domain name, a record which has all mail servers authorized to send messages with addresses within the domain is generated. The record is saved on all of the DNS servers that route the web traffic around the world, therefore they all can recognize if an email message originates from a trustworthy server or not. The verification is conducted at the very first server where the email goes through and in the first case the email message is forwarded, whereas in the second it is discarded and it never reaches the supposed recipient. Using SPF records for your domains will prevent all unwanted people from using your emails for harmful objectives.