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DKIM, DMARC, and SPF are the three main mechanisms maintaining the security of emails. The related protocols let you prevent unauthorized servers from sending as your domain and give recipients a way to verify emails really come from you.

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Source: https://www.cloudsavvyit.com/14608/dkim-dmarc-and-spf-setting-up-email-security/
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The Article Was Written/Published By: James Walker