How to turn off Couriers by AI subordinates

[Leffe7]

I think the automatic responses of AI subordinates can be turned off, but I don't remember how...
The messages are instantly created every time a regiment receives an individual command, not when I order the whole brigade.
I'm playing multiplayer. In MP options I have courier messages at level Brigade or above.

[NY Cavalry]

While in game hit the menu button and then options. It is under the general options.

[KG_Soldier]

NY Cav is right, but it doesn't work when playing courier by brigade. I've played in several of the Hits and Couriers games and always have them turned off, yet I too get the courier return spam.

But playing in GCM games with courier responses turned off, I only get player sent couriers.