I don't understand this one: > In IM2000, mailing lists are a purely local matter for the receiver's software. We still need to manage list of users we want t

I don't understand this one: > In IM2000, mailing lists are a purely local matter for the receiver's software. We still need to manage list of users we want to send notifications to, right? ("The message isn't copied to the receiver's ISP. All the receiver needs is a brief notification that a message is available.") Or is it expected there will be no "push" notifications for mailing lists, but I will actively ask about new messages in the list on every inbox refresh? That seems a bit wasteful, especially when this protocol seems to be concerned about efficiency.