On 6/9/25 14:23, Dan Caballero wrote:
Hello,
At the request of a list owner, we changed the settings on a list to "Anonymous =
No" so that list members could see who a message was coming from.
It seems a side effect of the setting is that users are now using "reply-to"
and some messages are going out to the list addressed in the manner below.
"Last Name, First Name via list-name <list-n...@caltech.edu>"
This is a consequence of DMARC mitigations.
The list owner feels this is confusing and some members may inadvertently email
the list when they intend to email the individual.
When the From is munged in that way for DMARC the orikinal From is put
in Reply-To: or perhaps Cc: depending on other settings. See
https://gitlab.com/mailman/mailman/-/blob/master/src/mailman/handlers/dmarc.py?ref_type=heads#L66-L85
for details of this process and its goals.
Assuming your list's Reply goes to list setting is No Munging The
original From: should be in Reply-To: of the delivered.
It appears that the messages that are sent
To: Last Name, First Name via list-name <list-n...@caltech.edu>
are sent by an MUA that is ignoring Reply-To: and replying to From:.
I understand this is likely a client side caching issue since most email
clients create an index of contacts based on previously received emails.
Aside from reverting back to "Anonymous = Yes", is there any setting we can change at
the list level to force the "to" field to persist as the list email address?
Do you mean you want the From: in delivered messages to be the original
poster's From: so that replies to the From: go to the OP. You can
accomplish this by setting DMARC mitigation action to No DMARC
mitigations, however this will ensure that any mail whose From: domain
publishes a DMARC policy of quarantine or reject will most likely be
bounced by all large ESPs.
We do are best to ensure that a simple reply to a message to which DMARC
mitigations are applied will go to the poster unless the Reply goes to
list setting says otherwise.
But I am confused as to your goal. Previously when the list was
anonymous, all replies went to the list. Maybe your goal is to have list
replies be addressed to <list-n...@caltech.edu> rather than Last Name,
First Name via list-name <list-n...@caltech.edu>. If that is the goal,
you could try setting Reply goes to list setting to Reply goes to list.
That will set a Reply-To: list's short description
<list-n...@caltech.edu>. That may be what you want as long as the
responder's MUA honors Reply-To: over From:
--
Mark Sapiro <m...@msapiro.net> The highway is for gamblers,
San Francisco Bay Area, California better use your sense - B. Dylan
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