SPF, which abbreviates Sender Policy Framework, is a verification system that aims at preventing the so-called email faking. Essentially, this means sending some message from one e-mail and making it look like it’s sent from a different one with the objective to scam in some way the individual getting it. In the event that the SPF protection is activated for a domain, a record which has all the mail servers authorized to send messages with addresses in the domain is created. The record is placed on all the DNS servers that route the web traffic worldwide, therefore they all will identify whether an e-mail message comes from a legitimate server or not. The check is conducted at the first server where the email goes through and in the first case the email message is forwarded, whereas in the second one it is removed and it never gets to the supposed recipient. Using SPF records for your domain names will stop all unwanted people from using your email addresses for harmful objectives.