Previously Jeff Garzik wrote:

These are _duplicate_ messages.  The To/CC doesn't vary in my 
experience.  Therefore, sorting on To/CC always guarantees my messages 
go into the correct folder.

It depends highly on how you filter. It do not use To/Cc headers
to choose the mailbox to deliver a message in since that will not work
with things like bounces and aliases. Using headers like List-Id or
X-Mailing-List is reliable, but does not work with the duplicate
filtering you suggested.

It is a matter of choosing your own preference. And ours seem to differ.

Wichert.

-- 
Wichert Akkerman [off-list ref]    It is simple to make things.
http://www.wiggy.net/                   It is hard to make things simple.