Sender Policy Framework, or SPF, is a verification system, that is designed to prevent the so-called email spoofing where an email message can be sent from one e-mail address, but to appear as being sent from another one, frequently with the objective to fraud the recipient for some reason. If SPF protection is enabled for a domain name, a specific record is generated for it in the Domain Name System and all the DNS servers globally receive it. The record contains all of the e-mail servers that are allowed to send legitimate messages from an address part of the domain. When an email is sent, the very first DNS server it goes to checks the SPF record and if the sending server is authorized, the message is forwarded to the target receiver. When, however, the sending server is not included in the SPF record for the specified domain, the e-mail message won't be sent 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 from you.