Sender Policy Framework, or SPF, is a verification system, that is used to stop the so-called email spoofing where an email message can be sent from one e-mail address, but to seem as being sent from a different one, typically with the idea to fraud the recipient for some reason. When SPF protection is enabled for a domain name, a unique record is generated for it in the Domain Name System and all of the DNS servers worldwide get it. The record includes all of the e-mail servers that are permitted to send legitimate messages from an address part of the domain. When a message is sent, the very first DNS server it goes to verifies the SPF record and when its sending server is authorized, the message is sent to the targeted destination. If, however, the sending server is not included in the SPF record for the specified domain, the email message will not be sent and it'll be removed. When you employ this service, it will stop third parties from sending spam that appear to have been sent from you.