The mailing list for listmasters using Sympa

[John Douglass <address@concealed>]

I was trying to use the web interface to overwrite some of the headers and it 
seems the headers get added instead of overwriting them...

Sample:

From: Operator <address@concealed>
From: address@concealed
List-Subscribe: 
<mailto:address@concealed?subject=subscribe%20oit-availability>
List-Unsubscribe: 
<mailto:address@concealed?subject=unsubscribe%20oit-availability>
List-Post: <mailto:address@concealed>
List-Owner: <mailto:address@concealed>
List-Archive: <https://lists.gatech.edu/sympa/arc/oit-availability>
List-Id: <address@concealed>
List-Help: <mailto:address@concealed?subject=help>
List-Subscribe: 
<mailto:address@concealed?subject=subscribe%20oit-avail-master>
List-Unsubscribe: 
<mailto:address@concealed?subject=unsubscribe%20oit-avail-master>
List-Post: <mailto:address@concealed>
List-Owner: <mailto:address@concealed>
List-Archive: <https://lists.gatech.edu/sympa/arc/oit-avail-master>

Why am I doing this?

I have a list named CSR and one named AVAILABILITY. They wanted to weed out 
duplicate messages going to one person from both lists so we created 
AVAIL-MASTER which does an include of CSR and AVAILABILITY.

We wanted it to appear (as much as possible) as coming from AVAILABILITY 
(hence attempting to overwrite the existing headers).

Anyone have any suggestions on how to do this? Or maybe there is a better way 
to configure my lists to weed out duplicates given two lists.

Thanks,
- John Douglass, Georgia Tech