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

On 9/15/2014 3:39 PM, Mark R. Williamson wrote:
> That’s almost always something the recipient’s mail system is doing, not LISTSERV.
>
> On Sep 15, 2014, at 3:07 PM, Shinn Wu <[log in to unmask]> wrote:
>> Hello,
>>
>> Is there any ListServ option that would allow identical message-ID to same recipient twice, e.g. could user A get two copies of if I send a post to list (user A in that list), and cc: to user A?
>>
>> I know ListServ would strip out a copy, and only sent one by default.
>>
>> Thank.
>>
>> Shinn
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