SPF, which is an abbreviation for Sender Policy Framework, is a certification system that aims at preventing the so-called email faking. Essentially, it indicates sending some message from one email and making it look like it’s sent from another one with the idea to scam in some manner the individual getting it. When the SPF protection is activated for a domain, a record which has all mail servers authorized to email messages with addresses under the domain is created. The record is stored on all the DNS servers that route the Internet traffic internationally, therefore they all will recognize if an email message originates from an authentic server or not. The verification is done at the very first server where the email goes through and in the first case the email message is forwarded, whereas in the second one it's discarded and it never gets to the intended recipient. Employing SPF records for your domains will stop any unwanted people from making use of your emails for harmful objectives.