ARC (Authenticated Received Chain)

The true magic of DMARC. This section explains "alignment"—the check that ensures the domain in the visible header (what the user sees) matches the domain that passed SPF or DKIM. This is what finally stops pirates from sailing under your flag.

15 questions in this topic

What is ARC? What problem does ARC solve? Why is ARC needed for email forwarding? How does ARC work? How does ARC preserve authentication results through forwarding? What are ARC headers (ARC-Seal, ARC-Message-Signature, ARC-Authentication-Results)? What is an ARC-seal vs ARC-message-signature? Does ARC help with DMARC failures on forwarded emails? Do I need to configure anything for ARC? How do ARC chains validate? What happens when ARC chains break? Who should implement ARC — senders or receivers? How does ARC relate to DMARC alignment? Why do ESP forwarders benefit from ARC? What are common ARC validation failures?

Questions about ARC (Authenticated Received Chain)