I took the Friday after the independence day free and apparently I didn’t have anything else to do, except to study SPF, DKIM, and DMARC. These are methods for senders to provide authentication for the sent emails to aid spam filters in detecting spoof attempts, with SPF and DKIM being a little bit older and more established, and DMARC being a newer method for communicating policy, building on the foundation of the other two.
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