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SPF is an abbreviation for Sender Policy Framework (SPF) for Authorizing Use of Domains in <a href="https://hackernoon.com/tagged/email" target="_blank">Email</a>. Email domains use this protocol to specify which Internet hosts are authorized to use this domain in the SMTP HELO and MAIL FROM commands. You do not have to use any additional software to publish the SPF policy and therefore this procedure is extremely simple: Simply add a TXT record containing the policy to the DNS zone. An example of this type of entry is given at the end of this article. There are numerous manuals and even online constructors for working with SPF.