Sender Policy Framework, or SPF, is a verification system, which is intended to stop the so-called email spoofing where an e-mail message is sent from one email address, but to look as being sent from a different one, usually with the idea to fraud the recipient in some way. If SPF protection is enabled for a domain name, a specific record is made for it in the Domain Name System and all the DNS servers globally have it. The record includes all of the e-mail servers that are allowed to send legitimate messages from an address under the domain. When an e-mail is sent, the very first DNS server it goes to checks the SPF record and if its sending server is permitted, the message is sent to the targeted destination. When, however, the sending server is not contained in the SPF record for the specified domain, the e-mail message won't be forwarded and it will be discarded. When you employ this solution, it'll stop third parties from sending spam emails that appear to have been sent by you.