SPF, which abbreviates Sender Policy Framework, is a certification system that is aimed at stopping the so-called email forging. In simple terms, this indicates sending a message from one email address and making it appear to be sent from another with the objective to scam in some manner the person getting it. When the SPF protection is activated for a domain, a record which contains all of the mail servers authorized to send messages with addresses under the domain is made. The record is kept on all the DNS servers that direct the web traffic around the world, therefore they all will identify whether an email message originates from a trustworthy server or not. The check is done at the first server where the email goes through and in the first case the email message is forwarded, while in the second it's removed and it never gets to the intended recipient. Employing SPF records for your domains will stop any unwanted people from making use of your email addresses for harmful purposes.