SPF, which abbreviates Sender Policy Framework, is an authentication system that aims at preventing the so-called email counterfeiting. Basically, this indicates sending some message from one email address and making it appear to be sent from another with the idea to scam in some way the person getting it. When the SPF protection is activated for a domain name, a record which contains all mail servers authorized to send messages with addresses within the domain is created. The record is placed on all DNS servers that direct the Internet traffic worldwide, thus they all will identify whether an e-mail message comes from a legitimate server or not. The verification is done at the first server where the e-mail goes through and in the first case the email message is forwarded, while in the second one it is removed and it never reaches the intended recipient. Employing SPF records for your domain names will stop any unwanted people from making use of your email addresses for harmful purposes.
