Unix how do you block unix/linux `wall` messaging?

Question

How do you block unix/linux wall messaging?

Example: 
SSH somemachine
WALL annoy the s*** out of people on machine

Desired goal: deny wall on owned machine

Answer 1

mesg n

From the man page

DESCRIPTION
   Mesg controls the access to your terminal by others.  It's typically used to allow or disallow other users to write to your terminal (see write(1)).

Edit:

This will not prevent root from sending wall messages