SPF, which abbreviates Sender Policy Framework, is a verification system that aims at preventing the so-called email counterfeiting. In simple terms, this indicates sending a message from one email address and making it seem to be sent from another with the purpose to scam in some way the person getting it. In case the SPF protection is active for a domain name, a record which has all the mail servers authorized to email messages with addresses part of the domain is made. The record is kept on all of the DNS servers that direct the Internet traffic across the globe, so that they all can recognize if an e-mail message originates from a valid server or not. The verification 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 it is removed and it never gets to the intended recipient. Employing SPF records for your domains will stop any unauthorized people from making use of your email addresses for harmful objectives.