a Header epidemic?

[Bill Campbell]

On Thu, Oct 02, 2014, Jean-Pierre A. Radley wrote:
>filePro Mailing List propounded (on Thu, Oct 02, 2014 at 03:33:11PM +0000):
>
>| Great word!  I, too, only got the "moon" part
>| ... etc ...
>| -- Mark Kaminsky
>
>Note who my MUA decided was doing the propounding when I hit 'R' to
>reply:: not Mark Kaminsky, but this list itself.
>
>Is there an epidemic? I ask because of the From: Header in Mark's
>message:
>
>From: Mark Kaminsky via Filepro-list <filepro-list at lists.celestial.com>, Mark Kaminsky <mbkaminsky at yahoo.com>
>
>What's with this "via" business in the From: Header???  Last week it
>seemed to have to do with mail flowing through aol.com, but Mark is
>posting through yahoo.com.

This is a rewrite by the current version of Mailman which changes
the From: header on some messages as Yahoo! and some others have
started rejecting mailing list traffic where the sending machine
isn't in the domain of the Sender.  This resulted in 30+
addresses being automatically unsubscribed due to bounces from
these servers.

Here's something relevant from the Mailman NEWS file.  See if you
can figure it out :-).

	The from_is_list feature introduced in 2.1.16 is now unconditionally
	available to list owners.  There is also, a new Privacy options ->
	Sender filters -> dmarc_moderation_action feature which applies to list
	messages where the From: address is in a domain which publishes a DMARC
	policy of reject or possibly quarantine.  This is a list setting with
	values of Accept, Wrap Message, Munge From, Reject or Discard. There is
	a new DEFAULT_DMARC_MODERATION_ACTION configuration setting to set the
	default for this, and the list admin UI is not able to set an action
	which is 'less' than the default.  The prior ALLOW_FROM_IS_LIST setting
	has been removed and is effectively always Yes. There is a new
	dmarc_quarantine_moderation_action list setting with default set by a
	new DEFAULT_DMARC_QUARANTINE_MODERATION_ACTION configuration setting
	which in turn defaults to Yes.  The list setting can be set to No to
	exclude domains with DMARC policy of quarantine from
	dmarc_moderation_action.

	dmarc_moderation_action and from_is_list interact in the following way.
	If the message is From: a domain to which dmarc_moderation_action applies
	and if dmarc_moderation_action is other than Accept,
	dmarc_moderation_action applies to that message.  Otherwise the
	from_is_list action applies.

	Also associated with dmarc_moderation_action are configuration settings
	DMARC_RESOLVER_TIMEOUT and DMARC_RESOLVER_LIFETIME. These are described
	in more detail in Defaults.py.  There are also new vette log entries
	written when dmarc_moderation_action is found to apply to a post.

Bill
-- 
INTERNET:   bill at celestial.com  Bill Campbell; Celestial Software LLC
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