SPF, which abbreviates Sender Policy Framework, is a certification system that is aimed at preventing the so-called e-mail faking. Essentially, this indicates sending some message from one email and making it appear to be sent from a different one with the idea to scam in some way the person opening it. When the SPF protection is activated for a domain, a record which has all of the mail servers authorized to email messages with addresses in the domain is generated. The record is placed on all the DNS servers that direct the Internet traffic all over the world, thus they all will identify whether an e-mail message comes from a trustworthy server or not. The verification is conducted at the very first server where the email goes through and in the first case the email message is forwarded, while in the second it's discarded and it never reaches the supposed recipient. Employing SPF records for your domains will prevent any unwanted people from using your email addresses for harmful objectives.