How email forwarding can break DMARC

You're sending emails from multiple sources, and while your DKIM and SPF are set up correctly, your DMARC report shows that SPF didn't pass due to forwarding, causing alignment issues. Forwarding can break DKIM authentication as it alters message content and headers, but sender information usually withstands forwarding. However, when forwarding occurs, the Return-Path header domain may not match the From domain, leading to SPF failure. To mitigate this, you can have both DKIM and SPF set up and take steps to prevent forwarding, such as using a 'reject' DMARC policy or leveraging mailbox providers' ability to identify forwarded emails through Authenticated Received Chain (ARC) standards, which allow authentication results to be added to message headers when an email is forwarded.

No tracked trend matches for this post yet.

Use this post, company, and trend context to find content marketing opportunities, perform competitive analysis, or address product feature gaps via the Plushcap MCP server or the Plushcap API.