SPF, which abbreviates Sender Policy Framework, is a certification system that aims at protecting against the so-called email counterfeiting. In simple terms, this means sending some message from one email and making it look like it’s sent from another with the purpose to scam in some way the individual opening it. In the event that the SPF protection is active for a domain, a record that contains all mail servers authorized to email messages with addresses within the domain is generated. The record is kept on all DNS servers that route the Internet traffic across the globe, so they all will recognize if an email message comes 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 message is forwarded, and in the second one it is removed and it never gets to the supposed recipient. Employing SPF records for your domain names will prevent all unauthorized people from using your email addresses for malicious objectives.