The duplicate messages will have the same Message-ID...
if they post a message they
*want* the reply to go to their main inbox as well as the mailing list
folder.
Maybe I am just stupid, or maybe my email client is inadequate, but I
cannot work out how to filter the same email such that different
copies go into different boxes. For me, all 3 or 4 copies of a cross-
post get filtered into the same box. I have not yet managed to find a
reliably distinguishing set of headers to separate them.
As for Reply-to: munging - I agree that _changing_ an existing header
would be bad, but would be very happy if mailing lists were to
_introduce_ one on messages where none already existed.
(I _am_ aware of the general polemic against using a default Reply-To:
header in mailing lists, e.g. http://www.unicom.com/pw/reply-to-harmful.html
but disagree fundamentally with many of the implicit assumptions and
explicit arguments therein.)
Regards,
Malcolm
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