Definition
Mail that passes through relayers can break SPF and DKIM. ARC lets each hop add a signed seal that survives forwarding.
Best Practices
- Check whether your senders and relays support ARC.
- Understand that DMARC still decides policy, with ARC context.
- Test authenticated chains when relay paths change.
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Frequently Asked Questions
It preserves authentication evidence when mail is forwarded.
No, it complements it by providing trust context.
Each intermediary that processes the message.