[Mailman-Users] A DMARC munging issue ... ?

Malcolm Austen malcolm.austen at weald.org.uk
Thu Jun 26 10:22:57 CEST 2014

On Wed, 25 Jun 2014 23:32:23 +0100, Mark Sapiro <mark at msapiro.net> wrote:

> On 06/25/2014 02:41 PM, Malcolm Austen wrote:
>> I won't call this a bug but I think it's an issue :-)
> It is an issue. I too am not sure whether it is a bug, but I think we
> need to do something about it. More below ...

Thanks Mark. For the time being I have removed AOL and Yahoo from that  
spam filter and marked all such addresses as 'moderated'. I'm guessing  
though that allowing them through would still escape the DMARC munging -  
so I've told the list that it's no longer accepting posts from AOL or  

(I note that neither yahoo.co.uk nor aol.co.uk have published a DMARC  

>> I have (via the GUI sender filters) dmarc_moderation_action set to
>> 'munge from' and yet a post from aol.com went through unmunged (and
>> caused 100+ subscribers to be disabled).
> This implies that the list's bounce_score_threshold is <= 1.0 so that a
> member's delivery is disabled on the first bounce. This may be too
> agressive.

I'm not that mean :-)

I should have made it clear that this message was the trigger rather than  
the lone cause.

I did (before I had 2.1.18-1 available) toy with setting it high (c.9 or  
10) and setting bounce_info_stale_after down to 1 so that I could let  
aol/yahoo posts out in a burst on one day and then hold them for a couple  
of days to clear the bounce scores.

> Also, you may be interested in
> <http://www.msapiro.net/scripts/reset_bounce.py>.

I would if I weren't restricted to the GUI :-(

Thanks though, if think get tough though, I could probably get my provider  
to run the script for me.

Thanks for all your (and others) work on mailman, Malcolm.

Malcolm Austen <malcolm.austen at weald.org.uk>
GENUKI trustee <genuki at weald.org.uk>
Oxfordshire FHS webmaster <webmaster at ofhs.org.uk>
PUG chairman <chairman at pugweb.org.uk>
FFHS Communications Officer <communications at ffhs.org.uk>

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