SPF, which is an abbreviation for Sender Policy Framework, is a verification system that is aimed at protecting against the so-called e-mail counterfeiting. 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 objective to scam in some way the individual receiving it. If the SPF protection is active for a domain, a record which contains all of the mail servers authorized to send messages with addresses in the domain is created. The record is saved on all the DNS servers that route the Internet traffic all over the world, therefore they all can recognize if an email message originates from a legitimate server or not. The verification is performed at the very first server where the email goes through and in the first case the e-mail message is forwarded, whereas in the second one it is removed and it never gets to its intended recipient. Using SPF records for your domain names will stop any unwanted people from making use of your emails for harmful objectives.