Implementing a program executed through the RUN action can be very
simple. In many cases, you may be able to use an existing text-
manipulation utility, either directly or by writing a simple wrapper that is
executed by the RUN action and that in turn calls the text utility.
IMPORTANT: For security purposes, the external program must be located
in the same directory of your Messaging Server as the UBE plugin
configuration file (instanceDirectory/smtp-bin/plugins/).