MM2 adds the header "Sender: LISTNAME-bounces@DOMAIN" to messages sent to list members.
That causes Outlook (among others?) to display the "originator" of a message from a REAL POSTER as:
LISTNAME-bounces@DOMAIN on behalf of REAL POSTER <REAL.POSTER@DOMAIN>That phrasing helps identify instantly what list a message is coming from, when that list doesn't use a Subject prefix and when its address isn't in the To: or Cc: headers. (And it turned out that some of our list members were even relying on it to trigger security alerts!)
It doesn't look like there's any current MM3 setting that would accomplish the same result, so the question is: How difficult would it be to revive the Sender: header?
I admit that I didn't read all 285 Mailman-users search results for query "Sender:", so apologies if that had been discussed before.
Thanks.