Click here for details on it. This file is an intermediate shell language that will allow you to setup auto-responders. By default we have setup a number of default autoresponders into your account which require no modifications in the .mreply.rc and .domains files. It routes to Mreply and sends a small auto-response message. This is where all of your autoresponder messages lie.
Word processors wll add unwanted formatting tags.
This can cause a mail loop which could crash the server. And of course, make sure to alter your .domains file to account for any name changes or additions.