[Mailman] DMARC and OSM lists

Michael Collinson mike at ayeltd.biz
Thu Sep 6 09:28:45 UTC 2018

Tom - FYI. /Mike

On 2018-09-06 11:15, Sergio Manzi wrote:
> Hello everybody,
> I'm the "/cuplrit/" of the situation and if there is any way I can 
> help you, please let me know!
> As I've already explained to Stefano that my domain (smz.it) DMARC 
> policy was strictly enforcing SPF and thus mail sent from 
> shenron.openstreetmap.org on my behalf was rejected and apparently 
> that caused quite a mess (/which I'm sorry for.../).
> I myself mange several mailman based mailing lists and the only way 
> I've so far found to fix the issue is to activate the "Reply-to 
> munging" option in the list "General" configuration: with that option 
> active the sender of redistributed messages is altered to the mailing 
> list address itself (/as a by-effect that also makes easier to reply 
> to the list and not just to the OP.../).
> When that option is active messages sent through the mailing list will 
> have the "From:" field altered so that it will appear as something like:
>     "From: Sergio Manzi via openstreetmap list - italiano
>     <talk-it at openstreetmap.org>"
> ... and the "Reply-To" field will be set as:
>     "Reply-To: Sergio  Manzi <smz at smz.it>, openstreetmap list -
>     italiano <talk-it at openstreetmap.org>"
> ... and that will ensure that my DMARC policy will not be considered 
> for messages relayed by the list.
> In the meanwhile I've made my DMARC permissive (p=none) and added 
> shenron.openstreetmap.org in my SPF configuration, but I lean to 
> consider this just a temporary solution, until the issue is addressed 
> in a more definitive way.
> Again, please let me know if I can be of any help...
> Regards,
> Sergio Manzi
> On 2018-09-06 10:49, Stefano wrote:
>> Hello,
>> I had a problem on talk-it that caused a mass unsubscription, which 
>> was caused apparently from a DMARC policy.
>> I was asked if it can be possible to activate the "Reply-to munging" 
>> option in Mailman to allow domains which enforce these policies to 
>> subscribe correctly.
>> I add in copy the user who reported the problem (sergio)
>> Thanks,
>> Stefano
>> (talk-it administrator)

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