Sender Policy Framework, or SPF, is a validation system, which is intended to prevent the so-called email spoofing where an email message can be sent from one email address, but to look as being sent from another, typically with the idea to fraud the recipient for some reason. When SPF protection is enabled for a domain name, a specific record is created for it in the Domain Name System and all DNS servers worldwide receive it. The record features all mail servers that are allowed to send legitimate messages from an address within the domain. When an e-mail is sent, the first DNS server it goes to checks the SPF record and when its sending server is permitted, the message is forwarded to the target receiver. When, however, the sending server doesn't exist in the SPF record for the specified domain, the e-mail message will not be submitted and it'll be removed. When you employ this solution, it'll prevent third parties from sending spam e-mails which look as if they have been sent by you.