How do SPF, DKIM, and DMARC work together?
- SPF authenticates the sending server.
- DKIM authenticates message integrity.
- DMARC checks alignment and chooses the policy.
- Think of it this way.
- SPF is the port of origin.
- DKIM is the wax seal on the cargo.
DMARC is the ship’s manifest checking that the flag on the ship matches either the port of origin or the cargo seal.
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