SPF, which is an abbreviation for Sender Policy Framework, is a verification system that aims at protecting against the so-called e-mail forging. Essentially, this means sending a message from one email and making it appear to be sent from a different one with the purpose to scam in some manner the individual getting it. When the SPF protection is active for a domain, a record that includes all of the mail servers authorized to email messages with addresses within the domain is generated. The record is kept on all the DNS servers that route the web traffic around the world, therefore they all will recognize if an email message comes from a trustworthy 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, whereas in the second it is discarded and it never gets to its intended recipient. Employing SPF records for your domains will prevent any unauthorized people from using your email addresses for harmful objectives.