Re: [Tools-discuss] DMARC handling default for IETF mailing lists?

Carsten Bormann <cabo@tzi.org> Thu, 11 April 2019 21:58 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Date: Thu, 11 Apr 2019 23:58:22 +0200
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To: Henrik Levkowetz <henrik@levkowetz.com>
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Subject: Re: [Tools-discuss] DMARC handling default for IETF mailing lists?
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Hi Henrik,

> On Apr 11, 2019, at 23:28, Henrik Levkowetz <henrik@levkowetz.com>; wrote:
> 
> Signed PGP part
> Hi Carsten,
> 
> On 2019-04-11 22:13, Carsten Bormann wrote:
>> I just configured a mailing list and noticed that the configuration selection
>> 
>> 
>> 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. 
>> (Details for from_is_list)
>> No	Munge From	Wrap Message
>> 
>> 
>> defaulted to “No”.  Does the list admin have to set this to “Munge From” manually?
>> (We don’t want to do that with known DMARC-bad source addresses, I believe.)
>> Or does “No” mean “Munge, if needed”?
> 
> I believe 'No' means "Don't Munge", and given that we are running a separate
> DMARC workaround, I believe this should not be set by default.  

Ah, thank you.

> If you set
> it, things should still work, but you'll replace our default DMARC workaround
> with the Mailman approach.

Don’t want to do that.

So maybe the prompt in the config section could have a sentence of the form “Don’t enable this unless you know what you are doing; there is a separate DMARC workaround ongoing.”

Grüße, Carsten

> 
> We're still hoping to be able to deploy ARC, which should be better than both
> the current default workaround and the Mailman workaround.
> 
> 
> Best regards,
> 
> 	Henrik
> 
>> 
>> Grüße, Carsten
>> 
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> 
> 
>