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List:       postfix-users
Subject:    Re: Validation DMARC
From:       Richard Damon <Richard () Damon-Family ! org>
Date:       2019-11-23 1:14:21
Message-ID: d7226c77-4dfe-e904-ad8e-330533e39b56 () Damon-Family ! org
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On 11/22/19 7:12 PM, Wesley Peng wrote:
> Hi
>
> when validating DMARC, it use the envelop address, or use from address
> from the header? Thanks  
>
DMARC specifically says that validation is to be based on the From:
Header of the message (which is different than how SPF and DKIM work by
themselves).

This is what gives DMARC issues with some uses of emails when messages
pass through relays which do things that break the message in route to
their final destination. The email RFCs say that the From: header is
suppose to indicate the author of the message, and the minor
modifications along the way done by the relays does not invalidate who
the author is, so the From should be retain.

Basically, this means that those domains that use DMARC, especially at
the higher levels, should not use those types of relays, which makes
some sense for the original intent of DMARC.

-- 
Richard Damon

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