I would like to add an alias to a distribution list with command line interface.
I see the command zmprov mdl list@domain attribute value, i found an attribute "ZimbraMailAlias" but i try it and i have an error "ERROR: service.INVALID_REQUEST (invalid request: zimbraMailAlias is immutable)"

My command line is :
zmprov mdl mailing-secretariat@epsm-al.fr ZimbraMailAlias secretariat@epsm-agglomeration-lilloise.fr

My command line is wrong?
Any idea?

ZCS version : 7.2.1_GA_2790.NETWORK 15 Aoû 12