[courier-users] Eliminating duplicate recipient addresses for local mail delivery

I'm using default mail delivery to ./Maildir in each user's home
directory, and I've got several distribution lists set up up as
multiple-recipient aliases (defined in Webadmin). If a specific
recipient occurs directly or indirectly in a message, that recpient
recieves multiple copies of the same message. E.g., sending a message
addressed like

To: user1
Cc: all

where all is an alias that sends to all users (including user1), causes
user1 to receive the message twice.

Is there a way to configure Courier to consolidate recipient addresses
so that in this case user1 would only receive the message once?

Chuck



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