ARC (Authenticated Received Chain)
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An email authentication protocol (RFC 8617) that preserves SPF, DKIM, and DMARC validation results across forwarding hops, solving the forwarding authentication breakage problem. Each forwarding server adds an ARC-Seal and ARC-Message-Signature header, creating a chain of trust back to the original sender. Receiving servers can evaluate the ARC chain when direct DKIM verification fails due to forwarding.