SPF, which is an abbreviation for Sender Policy Framework, is a certification system that aims at blocking the so-called e-mail forging. Basically, this indicates sending some message from one e-mail address and making it look like it’s sent from another one with the objective to scam in some manner the individual receiving it. When the SPF protection is running for a domain, a record that contains all mail servers authorized to email messages with addresses in the domain is created. The record is kept on all DNS servers that direct the web traffic globally, therefore they all can recognize if an email message originates from an authentic server or not. The verification is conducted at the first server where the e-mail goes through and in the first case the message is forwarded, and in the second it is discarded and it never reaches the supposed recipient. Using SPF records for your domain names will prevent any unauthorized people from making use of your emails for malicious objectives.