The mailing list for listmasters using Sympa

[Damien Morel <address@concealed>]

Hello,

I am installing Sympa for a large organisation, and I would like to 
define a new type of "reply_to_header", which would be halfway
between 'list' and 'all':
it should send to both list and sender but only
if sender is not already member of the list, so that the sender does not
get twice the same response to one of its messages (like when I choose
'all'), but so that he can get a response without being member of the list.

How can I do that?

Thanls in advance.
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