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How Mailing Lists Break DMARC, and Why ARC Only Partly Fixes It

Hacker Noon

TechnologyHacker Noon·Aug 15, 2026·1 min read

How Mailing Lists Break DMARC, and Why ARC Only Partly Fixes It

If you run a mailing list or any kind of forwarder and some of your subscribers quietly stopped receiving mail, DMARC is probably why. This is one of those problems baked into how the standards interact, not a bug you can configure away…

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