Mailing list questions (DMARC, ARC, more?)

[Matus UHLAR - fantomas]

On 25.08.22 18:10, Alessandro Vesely wrote:
>Thanks Ged for all the feedback.
>
>The lack of interest by others proves that From: munging is not so 
>much of a nuisance as they say...

This will come sooner or later, however:

earlier this year I've done small dmarc research for our client:

- microsoft software (on-premise exchange and 365) does not DKIM-sign DSN 
   e-mail (delivery and non-delivery notifications) although those have 
   sending domain in From: (I guess domain is added after sig generated)
- only a few % of domains has other DMARC policy than none
- mailman 2 (used here) only munges From: when domain DMARC policy for the 
   sending domain is other than none.

>>On Tue, 23 Aug 2022, Alessandro Vesely wrote:
>>>I see the list operates both From: munging and ARC sealing.  While 
>>>I'm clear about the former, I'm curious about how ARC works:
>>>
>>>Do any subscribers trust the seal by isc.org?

I guess most of recipients use predefined configurations, e.g. no 
whitelisting.

out of curiousity, I set my opendmarc.conf:

DomainWhitelist lists.isc.org

so we'll see next time mail comes.

-- 
Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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