SPF, which abbreviates Sender Policy Framework, is a verification system that aims at blocking the so-called e-mail faking. In simple terms, this indicates sending a message from one email and making it look like it’s sent from a different one with the idea to scam in some manner the individual opening it. When the SPF protection is activated for a domain name, a record that contains all the mail servers authorized to email messages with addresses in the domain is generated. The record is stored on all the DNS servers that direct the Internet traffic across the globe, thus they all will recognize if an e-mail message comes from an authentic server or not. The verification is done at the 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. Using SPF records for your domains will stop any unwanted people from making use of your email addresses for harmful purposes.