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spf dkim and dmarc are three tools that can be used to help prevent spoofing and validate email authenticity for your email service or domain and iamp;#39;m going to explain how they work and uh show you how to set them up in this uh in this lesson here so first letamp;#39;s talk about spf which stands for sender policy framework before i get started on the diagram that iamp;#39;m about to show you just from a high level spf is a mechanism that tells servers receiving email servers what servers are allowed to send mail on behalf of your domain it uses an spf record published in dns to do that so when youamp;#39;re setting up spf youamp;#39;ll publish your spf record to dns to the sending organizationamp;#39;s dns server and then when an email is sent out from your domain the receiving server receives it and performs an spf record lookup by querying dns for the spf record of the ascending domain to verify whether it came from an authorized sending server or ip address and then if