Sender Policy Framework, or SPF, is a validation system, that is intended to stop the so-called e-mail spoofing where an email message is sent from one email address, but to appear as being sent from a different, often with the objective to fraud the recipient in some way. When SPF protection is enabled for a domain name, a special record is generated for it in the Domain Name System and all the DNS servers globally have it. The record features all email 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 encounters verifies the SPF record and when the sending server is permitted, the message is forwarded to the target receiver. When, however, the sending server is not present in the SPF record for the particular domain, the e-mail message will not be forwarded and it will be removed. When you employ this service, it'll stop third parties from sending spam e-mails that look as if they have been sent from you.