How to prevent an end-user from sending messages to other end-users

In order to prevent users from sending messages to other end- users you need to modify the Learner user-type.

To implement this option, you must follow these steps;

a) Go to Admin->User-types 
b) Select the Learner type 
c) Go to Generic->Messages 
d) Retain the ability to send messages to Administrator and Course Instructors and tweak the options accordingly (1).

*Note that by default, a Learner cannot send messages to individuals but can send messages to members of their course, group or branch.

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