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ARC Seal — the ARC header field that signs the current ARC set and prior chain state, cryptographically linking one intermediary's set to the chain.
The mechanism complements SPF, DKIM, DMARC, or TLS and addresses a separate need, such as preserving authentication through forwarding, validating a brand, defining an encryption policy, or reporting failures. It does not replace baseline email authentication.
ARC Seal — the ARC header field that signs the current ARC set and prior chain state, cryptographically linking one intermediary's set to the chain.
It conveys an additional verifiable signal between sender and receiver when ordinary authentication or transport encryption is insufficient for a specific delivery scenario.
Establish correct DNS, SPF, DKIM, DMARC, and TLS first, then satisfy the selected specification. Verify reports and actual message headers, not only the presence of a DNS record.
