SPF, which is an abbreviation for Sender Policy Framework, is a certification system that aims at preventing the so-called email counterfeiting. Essentially, this means sending some message from one e-mail and making it look like it’s sent from another one with the purpose to scam in some manner the person receiving it. In the event that the SPF protection is running for a domain, a record which contains all the mail servers authorized to email messages with addresses under the domain is made. The record is kept on all the DNS servers that route the web traffic internationally, so that they all will identify whether an email message comes from a valid server or not. The verification is performed at the first server where the e-mail goes through and in the first case the e-mail message is forwarded, whereas in the second it is discarded and it never reaches the supposed recipient. Employing SPF records for your domain names will stop any unauthorized people from making use of your email addresses for harmful objectives.