This is true if your main computer is always on and connected to the internet. However where I live currently we have frequent power outages and internet connectivity issues. Some of these problems require my to restart routers in order to fix the problem. However, if I am traveling away from home I am not able to do this. In a case like this if my rules are on my main Mac at home and I am checking e-mail from an iPad of Macbook Pro on the road no rules will run.
Anyone else have thoughts on this?