SPF, which abbreviates Sender Policy Framework, is a verification system that aims at blocking the so-called e-mail faking. In simple terms, this indicates sending a message from one e-mail and making it look like it’s sent from a different one with the idea to scam in some way the individual getting it. When the SPF protection is active for a domain name, a record which contains all the mail servers authorized to email messages with addresses under the domain is generated. The record is saved on all of the DNS servers that route the Internet traffic worldwide, so they all will recognize whether an email message originates from an authentic server or not. The check is conducted at the first server where the e-mail goes through and in the first case the message is forwarded, while in the second it is discarded and it never gets to the intended recipient. Using SPF records for your domain names will prevent all unwanted people from making use of your emails for harmful objectives.