ARC helps preserve authentication results when emails are forwarded or sent through intermediaries. Learn how ARC works and when it improves deliverability.
ARC (Authenticated Received Chain) is a set of email headers that lets intermediaries record authentication results (SPF, DKIM, DMARC) as a message passes through forwarding services or mailing lists.
ARC can help mailbox providers trust forwarded mail that would otherwise fail DMARC due to changes made by the forwarder. It’s not a replacement for proper authentication, but it can reduce false positives in real-world forwarding scenarios.