Normally, the originator's email system would send send the cc: copy directly to user A and one copy to LISTSERV. LISTSERV should send only one copy to user A (the copy "through" the list); if it also observed the cc: and sent another copy, user A would receive three copies.

On Sep 16, 2014, at 10:35 AM, Shinn Wu <[log in to unmask]> wrote:
> Hi Mark,
> 
> But it was ListServ sent unique message-ID to single recipient as I saw from gateway (Barracuda) before it reached Exchange (which would certainly remove the duplication).  I also reviewed the ListServ log and maillog, and it only sent single copy even though sender cc: to recipient (who belonged to the list).
> 
> Shinn


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