Sender Policy Framework, or SPF, is a validation system, which is employed to stop the so-called e-mail spoofing where an email message is sent from one email, but to look as being sent from another one, ordinarily with the objective to fraud the recipient in some way. When SPF protection is enabled for a domain, a special record is made for it in the Domain Name System and all of the DNS servers around the world have it. The record contains all the e-mail servers that are permitted to send authentic messages from an e-mail address within the domain. When a message is sent, the first DNS server it goes to checks the SPF record and when its sending server is authorized, the message is forwarded to the target destination. If, however, the sending server is not included in the SPF record for the particular domain, the email message will not be forwarded and it will be discarded. Whenever you employ this solution, it will stop third parties from sending spam messages which appear to have been sent from you.