How can I deny messaging which use "wall" to send message out?

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wall

wall(1M)																  wall(1M)

NAME

       wall - write message to all users

SYNOPSIS

       groupname] [file]

DESCRIPTION

       Without	arguments, the command reads a message from standard input until end-of-file.  Then it sends this message to all currently logged-
       in users preceded by:

       If the option is specified, sends the message to all currently logged-in groupname members (as specified in preceded by:

       If file is specified, reads file instead of standard input.

       is typically used to warn all users prior to shutting down the system.

       The sender must have appropriate privileges to override any protections the users may have invoked (see mesg(1)).

       has timing delays, and takes at least 30 seconds to complete.

       You must have appropriate privileges to override any protections users may have invoked (see mesg(1)).

EXTERNAL INFLUENCES

   International Code Set Support
       Single- and multibyte character code sets are supported.

DIAGNOSTICS

       The open on a user's tty file failed.

WARNINGS

       The command will be WITHDRAWN from X/Open standard and may not be portable to other vendor's platforms.

AUTHOR

       was developed by AT&T and HP.

FILES

SEE ALSO

       mesg(1), write(1).

STANDARDS CONFORMANCE

																	  wall(1M)

UNIX for Dummies Questions & Answers