SPF, which abbreviates Sender Policy Framework, is a validation system that aims at preventing the so-called e-mail counterfeiting. In simple terms, this indicates sending some message from one e-mail and making it appear to be sent from another with the objective to scam in some way the individual receiving it. If the SPF protection is active for a domain name, a record which has all the mail servers authorized to send messages with addresses part of the domain is created. The record is placed on all the DNS servers that direct the web traffic internationally, so that they all can identify whether an email message comes from an authentic server or not. The verification is done at the very first server where the e-mail 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. Applying SPF records for your domains will stop any unwanted people from making use of your email addresses for harmful objectives.