Moss incoming and outgoing email settings

I found a good post today:

Http://www.cnblogs.com/yanghua/archive/2007/08/24/868380.html

How to: Use the Sharepoint Server's transfer out email function to integrate the Exchange Server

In this post, we have made a detailed description of the incoming and outgoing emails from Moss. It is really great to write and strongly supported!

However, I found a problem by applying it in my system, that is, enabling the new list after the incoming email settings can set the corresponding functions. However, the previously created list also allows you to apply the function of sending emails. I wonder if you have found this problem. If the expert has a solution, please advise me.