SPF, which abbreviates Sender Policy Framework, is a verification system that aims at protecting against the so-called email faking. Basically, this means sending some message from one email and making it look like it’s sent from another one with the idea to scam in some manner the person getting it. In case the SPF protection is active for a domain, a record that includes all of the mail servers authorized to send messages with addresses within the domain is made. The record is placed on all of the DNS servers that route the web traffic internationally, so they all can recognize whether an e-mail message originates from a trustworthy server or not. The verification is conducted 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 one it is discarded and it never gets to its intended recipient. Using SPF records for your domains will prevent any unauthorized people from using your emails for harmful objectives.