On Thu, 9 Dec 2004 15:03:11 +0100
Jacob Palme <jpalme(_at_)dsv(_dot_)su(_dot_)se> wrote:
A related issue is if a message arrives in two copies, one
with the recipient as personal recipient, the other via a
mailing list. When this happens, the cause is almost always
faulty handling by the sender's MUA, and the intention is
that the message should only be sent to/via the list.
not so. the sender's MUA doesn't know whether the personal
recipient is a member of that list or not, nor does it know
the personal recipient's preferences - so it doesn't know whether
a separate copy is required.
So in
this case, the best receiving MUA behaviour is probably to
completely suppress the personal copy of the message.
again, it depends on the personal recipient's preference, but this
would be a useful option.
All described above is easy to implement if the mailer
keeps a data base of message-ids and which messages they
refer to. A problem is that a few messages do not have
message-id, and a worse problem is that some very
unfriendly mailing list software will change the message-id
when expanding a message to a list.
another problem is that list and personal messages may arrive
in any order, which could mean that (as it looks to the recipient)
a message disappears from one folder and appears in another.