SPF, which is an abbreviation for Sender Policy Framework, is a validation system that aims at blocking the so-called e-mail counterfeiting. Essentially, this indicates sending some message from one e-mail address and making it look like it’s sent from a different one with the idea to scam in some manner the individual receiving it. When the SPF protection is running for a domain, a record that contains all of the mail servers authorized to send messages with addresses in the domain is generated. The record is stored on all the DNS servers that direct the Internet traffic around the world, thus they all will recognize whether an e-mail message originates from a trustworthy server or not. The check is conducted at the first server where the e-mail goes through and in the first case the e-mail message is forwarded, and in the second one it's discarded and it never gets to the intended recipient. Employing SPF records for your domains will stop any unauthorized people from making use of your email addresses for harmful objectives.