SPF, which is an abbreviation for Sender Policy Framework, is a verification system that is aimed at preventing the so-called e-mail counterfeiting. In simple terms, this indicates sending some message from one email and making it seem to be sent from another one with the purpose to scam in some way the individual opening it. In the event that the SPF protection is activated for a domain name, a record which contains all the mail servers authorized to email messages with addresses under the domain is generated. The record is kept on all the DNS servers that route the Internet traffic worldwide, therefore they all can recognize whether an e-mail message comes from a valid server or not. The verification is performed at the first server where the email goes through and in the first case the e-mail message is forwarded, and in the second one it is removed and it never reaches its intended recipient. Employing SPF records for your domain names will stop any unauthorized people from using your emails for malicious objectives.