How to Globally Limit Maximum Message size

Introduction:
One more Exchange design goof, is that a maximum message size may be imposed on individual mailboxes, but not on a global basis.  While the MTA has a maximum message size limit as well, setting this will only serve to limit messages leaving and entering the server.  The following procedure is a work around, which will force all messages to be routed through the MTA.  Even messages local to a single server.

Procedure:
To force all messages through the MTA, Make the following registry change: