Sender Policy Framework, or SPF, is a validation system, which is intended to prevent the so-called email spoofing where an e-mail message can be sent from one e-mail address, but to appear as being sent from another, often with the objective to scam the recipient someway. When SPF protection is enabled for a domain, a unique record is generated for it in the Domain Name System and all of the DNS servers worldwide get it. The record contains all mail servers that are permitted to send authentic messages from an email address part of the domain. When an email is sent, the very first DNS server it encounters checks the SPF record and in case the sending server is permitted, the message is sent to the target receiver. If, however, the sending server is not present in the SPF record for the specified domain, the email message won't be forwarded and it will be removed. When you employ this service, it will stop third parties from sending spam messages that appear to have been sent by you.