SPF, which abbreviates Sender Policy Framework, is a validation system that is aimed at stopping the so-called email counterfeiting. In simple terms, this indicates sending some message from one e-mail and making it appear to be sent from another with the objective to scam in some way the person getting it. In the event that the SPF protection is activated for a domain name, a record that includes all of the mail servers authorized to email messages with addresses in the domain is created. The record is kept on all the DNS servers that direct the Internet traffic all over the world, so they all can recognize whether an email message comes from an authentic server or not. The verification is conducted at the first server where the e-mail goes through and in the first case the message is forwarded, but in the second one it is removed and it never reaches the intended recipient. Applying SPF records for your domain names will stop all unwanted people from making use of your email addresses for malicious purposes.