[MM3-users] Changing posting address

Dear list,

I'd like to change the sending address of a mailinglist, but when I try to set it via mmclient with

./manage.py mmclient lists=client.lists l=lists[listnumber] l.settings['posting_address']='new name'

I get ValueError: value is read-only.

Is it possible to change this value, or should I use another setting for this objective?

Best regards,

Johannes Winter