I use the X-BeenThere: header. It's present on list mail but not
on cc's people send as either (depending on your perspective) a
courtesy or a curse.
It can't be that reliable? Just checking through my directory which has
mails of well over 100 different lists stored (never more than 1 list
per file), and only 37 files contain an ^X-BeenThere at all. It's a
possible criteria though.
This looks like another one of those non-straightforward problems :(
Anyone already got part of the way, for someone to continue??
Thanks,
Volker
--
Volker Kuhlmann is possibly list0570 with the domain in header
http://volker.dnsalias.net/ Please do not CC list postings to me.
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