Does ARC help with DMARC failures on forwarded emails?
Yes. ARC provides context that helps mailbox providers understand that a message originally passed authentication before forwarding broke SPF or DKIM. ARC does not override DMARC, and it does not force acceptance. It simply offers evidence.
Providers such as Gmail and Microsoft treat ARC as a weak but meaningful signal. They may accept a forwarded message with a broken DMARC alignment if the ARC chain is valid and trustworthy.
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