Hi, I have done that. the problem with the max recipient, is that it then allows for people to send also to other subscribers. also, if you set it to 1, I can only send to one person on the list. This happens, I have tested it many times. I have found that you have to set it to the number of actual people in the directory, otherwise you can only send it to the first person on the list if you set it to only one.
We have tested it and it does it. You need to test it yourself because it doenst work the way that you are describing.
I have blocked all sub to sub messages as you direct.