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List:       postfix-users
Subject:    Re: Validation DMARC
From:       Richard Damon <Richard () Damon-Family ! org>
Date:       2019-11-23 14:31:38
Message-ID: dfab863f-0326-11fc-043c-75e4aebc2ca1 () Damon-Family ! org
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On 11/23/19 4:13 AM, Roland Köbler wrote:
> Hi,
>
>> when validating DMARC, it use the envelop address, or use from address from the header?
> it unfortunately uses the from-header.
> (If it would use the envelope address, it would not cause that much
> problems.)
>
> Or in short: DMARC intentionally breaks every mailinglist and every mail-forwarding.
> So, if a mail-provider uses a strict DMARC-policy, it effectively
> says: "Our mail-addresses may not be used for mailinglists."
>
> The cleanest solution for mailinglists would be to reject mails from
> such adresses. (Spoofing the From-header by removing the authors address
> and replacing it by the lists address, and so hiding the original author,
> could of course also be done, but is not really a good solution.)
>
> Roland
>
When Yahoo first implemented this many years ago, and caused massive
disruption to the mailing list community, that WAS one of the proposed
solutions, put yahoo.com on the 'can not post' list, but it realized
that it wouldn't really hurt yahoo, only some of its subscribers. It
might cause some members to leave Yahoo, but unlikely enough to really
matter to them, and might drive more traffic to Yahoo Groups (which at
the time was making them money, and got around the problem because it
was part of Yahoo).

-- 
Richard Damon

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