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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