Sender Policy Framework, or SPF, is a verification system, which is designed to prevent the so-called e-mail spoofing where an e-mail message can be sent from one email, but to look as being sent from a different, ordinarily with the purpose to fraud the recipient for some reason. When SPF protection is enabled for a domain, a special record is created for it in the Domain Name System and all the DNS servers worldwide have it. The record contains all email servers that are permitted to send authentic messages from an address under the domain. When an email is sent, the first DNS server it goes to verifies the SPF record and when the sending server is permitted, the message is sent to the target receiver. In case, however, the sending server is not contained in the SPF record for the particular domain, the email message won't be submitted and it will be discarded. When you employ this solution, it will prevent third parties from sending spam emails that look as if they have been sent by you.