[mlmmj] Mailing Lists and DKIM signing breaking when sender DKIM policy is REJECT

Hi All,

We run a mailing list using mlmmj on our mail server.  Recently I've had =
clients report that emails either aren't delivered to some recipients or =
end up in spam for other recipients.  This started Feb apparently.

Digging into it further, I discovered that the client in question had =
set up their DMARC policy to REJECT.

This meant whenever they sent an email via our mailing list, their =
original dkim signature, after us forwarding on, was failing. And =
depending on the destination mail server it was either rejected =
completely (eg. mac.com) or sent to spam (eg. Google.com).


I set up a Google mailing list and looked into how they handle mailing =
lists.  It appears they strip out all relevant authentication headers =
and replace the 'FROM' with:   "'Sender Name' via List Name" =
<[email protected]>

And based on this I have got to the point where I've replicated this =
behaviour, stripping the relevant headers and replacing the 'From' with =
the list name.

The only thing I haven't worked out is how to insert the original =
senders name into the 'From' so each message at least looks like it came =
from someone different.


Anyone have any ideas on how I can achieve this last bit in the puzzle ?

Thanks
Kent.



I followed these instructions:  http://mlmmj.org/docs/tunables/

1) Edited 'contentheaders' to:
----
Precedence: bulk
From: List Name <[email protected]>
X-Mailing-List: [email protected]
List-Id: <[email protected]>
List-Post: <mailto:[email protected]>
List-Subscribe: <mailto:[email protected]?subject=3DSubscribe>
List-Unsubscribe: =
<mailto:[email protected]?subject=3DUnsubscribe>
----

2) Edited 'delheaders' to:
----
From:
DKIM-Signature:
X-Google-DKIM-Signature:
X-Gm-Message-State:
X-Google-Smtp-Source:
Authentication-Results:
ARC-Seal:
ARC-Message-Signature:
ARC-Authentication-Results:
-----