Sender Policy Framework, or SPF, is a verification system, which is intended to prevent the so-called email spoofing where an e-mail message can be sent from one email, but to look as being sent from a different one, typically with the purpose to fraud the recipient someway. When SPF protection is enabled for a domain name, a specific record is created for it in the Domain Name System and all of the DNS servers globally have it. The record contains all mail servers that are allowed to send authentic messages from an email address part of the domain. When a message is sent, the first DNS server it encounters verifies the SPF record and when its sending server is permitted, the message is forwarded to the target receiver. If, however, the sending server is not present in the SPF record for the given domain, the e-mail message will not be submitted and it'll be discarded. When you employ this solution, it will stop third parties from sending spam e-mails which look as if they have been sent by you.