Sender Policy Framework (SPF) is an email authentication method designed to detect the forgery of the sender's email address during the delivery of the email. However, SPF alone has a limit. Only in combination with DMARC can it be used to effectively detect the email spoofing.SPF allows the receiving mail server to check that an email claiming to come from a specific domain is submitted by an IP address authorized by that domain's administrators. The list of authorized sending hosts and IP addresses for a domain is published in the DNS records for that domain.