On 09/21/2016 09:26 AM, Clare Redstone wrote:
> I administer a Mailman discussion group and don't understand what's showing
> up in the CC box of messages in the group. One member is concerned as her
> messages display her email address in the CC box. For most of us, our name
> is displayed in the CC box. (In Outlook I can right-click on that and it
> shows the sender's email address but I don't think she realised our
> addresses are accessible, just not so obvious.)

Probably, what's in the Cc: header in all cases is something like

Real Name <r...@example.com>

or maybe just


How this is displayed by the email program reading the mail is a
function of that program (Outlook or whatever).

> Why are her messages behaving differently in this way and how can I change
> it?
> "Replace the From: header address with the list's posting address to
> mitigate issues stemming from the original From: domain's DMARC or similar
> policies.." Setting: Munge From
> "Where are replies to list messages directed?..." Setting: This list
> Any ideas what's going on and how to stop this member's address displaying
> openly?

When from_is_list = Munge From, the original From: header is replaced by

From: user_name via list_name <l...@example.com>

and the original From: is placed in Reply-To: or since Mailman 2.1.19,
if reply_goes_to_list = This list, in Cc: to expose the original
sender's address and facilitate replying to that address.

I suspect the difference in this user's case is that for her posts, here
original From: header has just her email address rather than her name
and address, so just the bare email address gets put in Cc:

Also note, that from_is_list = Munge From is currently deprecated in
favor of from_is_list = No, and Privacy options... -> Sender filters ->
dmarc_moderation_action = Munge From.

This will apply DMARC mitigations only to those mesages From: a domain
that publishes a DMARC p=reject (or quarantine) policy.

Mark Sapiro <m...@msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan
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