SPF, which is an acronym for Sender Policy Framework, is an e-mail safety system, that is is intended to confirm whether an email message was sent by an official server. Employing SPF protection for a particular domain name will stop the faking of emails created with the domain. In simple words: activating this feature for a domain creates a particular record in the Domain Name System (DNS) containing the IP of the servers that are allowed to send email messages from mailboxes using the domain. As soon as this record propagates globally, it will exist on all DNS servers that direct the Internet traffic. Every time some email message is sent, the first DNS server it goes through checks whether it originates from an accredited server. If it does, it's forwarded to the destination address, yet if it doesn't originate from a server indexed in the SPF record for the particular domain, it's rejected. Thus nobody will be able to mask an email address then make it look as if you're distributing spam. This approach is also identified as email spoofing.