The mailing list for listmasters using Sympa

["Roger B.A. Klorese" <address@concealed>]

Is there some combination of build options and patches that will enable 
Sympa to build per-robot and per-list-within-robot aliases and to fully 
support rejection (NOT bouncing) of non-existent addresses within the 
robot subdomains?

(And if it requires patching, this seems to be a major use case - 
shouldn't it be in the base distribution?)