SPF, which is an abbreviation for Sender Policy Framework, is a verification system that is aimed at stopping the so-called e-mail counterfeiting. Essentially, this indicates sending a message from one email and making it seem to be sent from another one with the idea to scam in some way the individual getting it. If the SPF protection is running for a domain name, a record which includes all of the mail servers authorized to email messages with addresses in the domain is generated. The record is saved on all the DNS servers that route the Internet traffic around the world, thus they all can identify whether an email message originates from a trustworthy server or not. The check 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 one it's removed and it never reaches its intended recipient. Employing SPF records for your domain names will stop any unwanted people from using your email addresses for harmful purposes.