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Deliverability Letter

Authenticated Received Chain (ARC)

Also known as: ARC, Email ARC

Authenticated Received Chain (ARC) is an email standard that keeps your authentication results when a message is forwarded or passes through mailing lists. It lets receiving servers see that earlier checks passed even if SPF or DKIM now look broken.

Authenticated Received Chain is like a travel log for your email. Each server that handles the message records what it saw about your authentication. That history travels with the email. This helps the final mailbox provider understand what really happened along the way.

ARC matters when your emails often go through mailing lists, forwarders, or help desk tools. Those tools can change the message and cause normal checks such as SPF or DKIM to fail. With ARC in place, the receiving server can see that your email was valid before those changes. This reduces the chance that good email ends up in spam.

If you run a mailing list or any service that forwards email, work with your provider or team to enable ARC. Start by turning it on in a test environment and checking delivery to major inbox providers. Watch your authentication reports for fewer failures on forwarded traffic. Over time this can protect your reputation and keep important messages visible.