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DMARC methods in mailman --- [LEDE-DEV] DMARC related mass bounces / disabled subscriptions (fwd) Jo-Philipp Wich: [LEDE-DEV] DMARC related mass bounces / disabled subscriptions

Michael Richardson <mcr@sandelman.ca> Wed, 14 December 2016 14:26 UTC

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From: Michael Richardson <mcr@sandelman.ca>
To: ietf@ietf.org
Subject: DMARC methods in mailman --- [LEDE-DEV] DMARC related mass bounces / disabled subscriptions (fwd) Jo-Philipp Wich: [LEDE-DEV] DMARC related mass bounces / disabled subscriptions
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Date: Wed, 14 Dec 2016 09:25:48 -0500
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It is unfortunate that the IETF hasn't shown more leadership here.
Auto-learning address books are going to have a problem with From lines that
say:

        First Last Name Via LISTNAME <listaddress@example.com>

since this will hijack "First Last" to point to the list, which is going to
cause all manner of email leaks.  Maybe we can do better there.
--- Begin Message --- 
Hi list,

a recent mailing list post from a DMARC enabled domain caused a large
flood of bounces from various mail providers, causing an automatic
disabling of about 190 subscriptions [1].

I re-enabled those subscriptions manually so there is no need for
further action on your side.

In order to mitigate this problem in the future, I configured this list
to wrap mails from DMARC enabled domains into an outer mail using the
mailing list itself as sender [2].

Please excuse the inconvenience caused by this issue.


Regards,
Jo

1:
http://thehackernews.com/2014/04/yahoos-new-dmarc-policy-destroys-every.html
2:
https://wiki.list.org/DOC/Mailman%202.1%20List%20Administrators%20Manual#line-544


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