Sender Policy Framework, or SPF, is a verification system, which is intended to prevent the so-called e-mail spoofing where an e-mail message can be sent from one email, but to appear as being sent from a different one, frequently with the purpose to scam the recipient in some way. When SPF protection is enabled for a domain name, a unique record is created for it in the Domain Name System and all DNS servers globally have it. The record includes all the email servers that are permitted to send valid messages from an address under the domain. When a message is sent, the very first DNS server it encounters verifies the SPF record and when the sending server is authorized, the message is sent to the target destination. In case, however, the sending server is not contained in the SPF record for the given domain, the e-mail message won't be submitted and it will be discarded. When you employ this service, it will stop third parties from sending spam emails that look as if they have been sent from you.