SPF, which abbreviates Sender Policy Framework, is a certification system that aims at stopping the so-called email faking. Basically, this means sending some message from one e-mail and making it seem to be sent from another one with the purpose to scam in some way the person getting it. In the event that the SPF protection is active for a domain name, a record that includes all the mail servers authorized to email messages with addresses in the domain is generated. The record is placed on all the DNS servers that route the Internet traffic worldwide, thus they all will identify whether an e-mail message comes from a valid server or not. The verification is performed at the very first server where the email goes through and in the first case the e-mail message is forwarded, but in the second one it is discarded and it never reaches the supposed recipient. Employing SPF records for your domains will prevent any unwanted people from using your emails for harmful objectives.