Hi,
We've noticed a problem with the way listen is threading messages in the
archive.  Take a look at this thread:
http://www.openplans.org/projects/astor-playa/lists/astor-playa-project/archive/2007/06/1180965651338/forum_view

What probably happened was people, out of convenience, initiated a new
message by replying to an unrelated message from the list and then
changing the subject line and deleting the body.  Since listen threads
messages in the archive using hidden "in-reply-to" and "references"
fields, these improperly caused this new message to be threaded with the
existing thread.

Gmail handles threading differently.  From what we can tell, it does an
intelligent match on the subject lines of messages to create
"conversations."  In the case in which subject lines match in messages
that are sent months (or some period of time) apart, it assumes they are
independent "conversations."  I could see this causing problems in
conversations where someone legitimately wants to modify the subject
line without breaking the thread.

So, learning from gmail, we may want to take steps to improve on
listen's threading behavior.  We should probably spend more time
studying gmail's (and other) threading behavior and come up with a new
specification and thus avoid this rare but odd situation we are seeing
in the astor-playa list.

Thanks,
cabraham and rmarianski


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