[Mailman] DMARC and OSM lists

Sergio Manzi smz at smz.it
Thu Sep 6 09:15:16 UTC 2018

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...


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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