Infrastructure
DMARC
DMARC is a setting you attach to your web address that tells the world's mail servers which systems are allowed to send email in your name, and what to do with anything that fails the check. It works alongside two related settings, SPF and DKIM, which prove a message genuinely came from your systems. All three live with your web address settings, not inside your email app.
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Member lesson
The definition and sources are public. The complete practical lesson is for members.