Sender Policy Framework, or SPF, is a verification system, which is used to stop the so-called e-mail spoofing where an e-mail message can be sent from one e-mail address, but to look as being sent from a different, usually with the objective to fraud the recipient for some reason. If SPF protection is activated for a domain name, an exclusive record is created for it in the Domain Name System and all of the DNS servers globally receive it. The record features all mail servers that are permitted to send valid messages from an email address part of the domain. When an e-mail is sent, the first DNS server it goes to checks the SPF record and in case the sending server is authorized, the message is forwarded to the targeted receiver. If, however, the sending server is not present in the SPF record for the particular domain, the message will not be forwarded and it will be removed. Whenever you employ this solution, it will stop third parties from sending spam emails that appear to have been sent by you.