Re: [PLUG] Mailing list admin notice -- unsubscribe and resubscribe

[Rich Kulawiec <rsk@gsp.org>]

On Thu, Jul 04, 2019 at 01:33:25PM -0400, Walt Mankowski wrote:
> I'm confused by the version numbers. 2.1.18 looks like it does have a
> setting for this. There's something that says
> 
>   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.
> 
> It looks like we just need to change that from "No" to "Munge
> From". Or is there something else that was fixed in 2.1.29? 

There were fixes to DMARC-related code in 2.1.25, 2.1.24, 2.1.22, etc. --
check the file "NEWS" inside the Mailman source code distribution. There
are also various security fixes that are worth picking up.  So pretty much,
if you're going to upgrade anyway, might as well migrate to the latest.

The settings I've fiddled with for DMARC are:

dmarc_moderation_action
dmarc_quarantine_moderation_action
dmarc_none_moderation_action

and you'll need dnspython (I'm using 1.15.0) because Mailman uses
it to do the DNS lookups necessary to figure out if originating domains
have DMARC deployed and what they have it set to, and then you may
need setuptools because it's required to build dnspython.  (I should
caveat this: I build from source.  If you're installing packages,
then some of this may be picked up automagically.)

And then you'll need to patch mailing list users. ;)

---rsk
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