Hi,

First, apologies if this has been discussed before. I run a number of mailman lists on a Centos 6 platform and mailman 2.1.12-25. This version was updated in July as follows: https://rhn.redhat.com/errata/RHSA-2015-1417.html and included fixes for a number of DMARC issues. Including "... With this update, domains with a "reject" DMARC policy are recognized correctly.."

Normally the lists we use are configured with reply_goes_to_list and anonymous_list is off. We have done some testing, and we have not been able to identify settings that will retain reply_goes_to_list functionality and turn on DMARC Mung.

Generally what happens is that the first message is successfully sent to a yahoo.com address and this user can reply to the message as normal. However, mailman adds the original sender to the reply-to meaning that when another user replies to this message reply_goes_to_list doesn't work.

It seemed to me that a small modification to CookHeaders.py could prevent the adding of 
the original sender email to "Reply-To"

        # We also need to put the old From: in Reply-To: in all cases.
        if o_from:
            add(o_from)
        # Set Reply-To: header to point back to this list.  Add this last

seemed like a good place to look, but before I try to debug commenting out this 
didn't prevent the addition of the original sender to Reply-To I would ask for 
some advice !!

any assistance would be very helpful!!   (it maybe that changing the order of 
addresses in the Reply-To field would all reply_goes_to_list would work?)

thanks
Mark.



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