[ClusterLabs] Antw: [EXT] Re: @ maillist Admins ‑ DMARC (yahoo)

Ulrich Windl Ulrich.Windl at rz.uni-regensburg.de
Tue Jul 13 04:23:14 EDT 2021

>>> <kgaillot at redhat.com> schrieb am 12.07.2021 um 16:50 in Nachricht
<08471514b28d1e3f6859707f5951f07887336865.camel at redhat.com>:
> On Sat, 2021‑07‑10 at 12:34 +0100, lejeczek wrote:
>> Hi Admins(of this mailing list)
>> Could you please fix in DMARC(s) so those of us who are on 
>> Yahoo would be able to receive own emails/thread.
>> many thanks, L.
> I suppose we should do something, since this is likely to be more of an
> issue as time goes on. Unfortunately, it's not as simple as flipping a
> switch. These are the two reasonable choices:
> (1) Change the "From" on list messages so that they appear to be from
> the list, rather than the poster. For example, your posts would show up
> as "From: lejeczek via ClusterLabs Users <users at clusterlabs.org>"
> rather than "From: lejeczek <peljasz at yahoo.co.uk>". This is less
> intrusive but makes it more difficult to reply directly to the sender,
> add the sender to an address book, etc.
> (2) Stop adding [ClusterLabs] to subject lines, setting ReplyTo: to the
> list instead of original author, and adding the list signature. This is
> more standards‑compliant, since the List‑* headers can still be used
> for filtering, unsubscribing, and replying to the list, but not all
> mail clients make those easy to use.
> Anyone have preferences for one over the other?

I have no idea about DMARC, so I'm qualified for an opinion ;-)
My guess is that the changes mentioned to the original message make the DMARC
signature invalid.
IMHO the best solution would be to (if at all) chack DMARC on receipt, and
"re-sign" before sending it out to the list.


> (Less reasonable options include wrapping every post in MIME, and
> disallowing users from DMARC domains to post to the list.)
> ‑‑ 
> Ken Gaillot <kgaillot at redhat.com>
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