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DMARC! DMARC (Domain-based Message Authentication Reporting and Conformance) specifies the disposition of spam emails. The legitimate owner of the originating email domain can choose to have these messages accepted, sent to a spam folder, or rejected. SPF! SPF (Sender Policy Framework) is a list of all authorized mail servers for a specific domain. All legitimate emails would be sent from one of the servers listed in the SPF configuration. NAC! NAC (Network Access Control) is a way to limit network access to only authorized users. NAC is not commonly used to manage the transfer of email messages. DKIM! DKIM (Domain Keys Identified Mail) provides a way to validate all digitally signed messages from a specific email server. DKIM does not determine how the receiving server categorizes these digitally signed messages.