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List: postfix-users
Subject: Re: Validation DMARC
From: "Wesley Peng" <wesley () thepeng ! eu>
Date: 2019-11-23 9:19:53
Message-ID: c1a77fb5-f1b6-49a2-af34-b3ef539e09e8 () www ! fastmail ! com
[Download RAW message or body]
Google groups replace the from: with their group address. What I know the big \
providers having strict DMARC setting are:
mail.ru
laposte.net
I am glad the more large providers like gmail, outlook don't have this stupid \
setting.
Regards
On Sat, Nov 23, 2019, at 5:13 PM, 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
>
>
[Attachment #3 (text/html)]
<!DOCTYPE html><html><head><title></title><style \
type="text/css">p.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><div>Google \
groups replace the from: with their group address. What I know the big providers \
having strict DMARC setting \
are:<br></div><div><br></div><div>mail.ru<br></div><div>laposte.net<br></div><div><br></div><div>I \
am glad the more large providers like gmail, outlook don't have this stupid \
setting.<br></div><div><br></div><div>Regards</div><div><br></div><div>On Sat, Nov \
23, 2019, at 5:13 PM, Roland Köbler wrote:<br></div><blockquote type="cite" \
id="qt"><div>Hi,<br></div><div><br></div><div>> when validating DMARC, it use the \
envelop address, or use from address from the header?<br></div><div>it unfortunately \
uses the from-header.<br></div><div>(If it would use the envelope address, it would \
not cause that much<br></div><div>problems.)<br></div><div><br></div><div>Or in \
short: DMARC intentionally breaks every mailinglist and every \
mail-forwarding.<br></div><div>So, if a mail-provider uses a strict DMARC-policy, it \
effectively<br></div><div>says: "Our mail-addresses may not be used for \
mailinglists."<br></div><div><br></div><div>The cleanest solution for mailinglists \
would be to reject mails from<br></div><div>such adresses. (Spoofing the From-header \
by removing the authors address<br></div><div>and replacing it by the lists address, \
and so hiding the original author,<br></div><div>could of course also be done, but is \
not really a good solution.)<br></div><div><br></div><div>Roland<br></div><div><br></div><div><br></div></blockquote><div><br></div></body></html>
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