SPF, which abbreviates Sender Policy Framework, is a validation system that aims at stopping the so-called email forging. In simple terms, this indicates sending a message from one e-mail and making it seem to be sent from another with the purpose to scam in some manner the person opening it. If the SPF protection is active for a domain, a record which has all mail servers authorized to email messages with addresses in the domain is created. The record is kept on all of the DNS servers that direct the Internet traffic globally, thus they all will identify if an email message originates from a legitimate server or not. The verification is done at the very first server where the e-mail goes through and in the first case the message is forwarded, while in the second it is removed and it never gets to its intended recipient. Employing SPF records for your domains will prevent all unauthorized people from making use of your email addresses for malicious purposes.