In order for some of the functions of eMail Xpress to work correctly you will need to install the associated Espy fonts and AppleScript OSAX.
To install the supporting OSAX you need to located and open your Scripting Additions folder and drop the two OSAX "Jon's Command" & "Choose From List" into this folder.
The folder path is as follows...
System Folder >> Extensions >> Scripting Additions
Put the two scripting OSAX into the Scripting Additions folder.
Configuration!
Here are some important steps you need to watch out for.
#1. Getting eMX to work with my email applications?
eMX needs to have its email application that is specified be exactly the same as is named in the finder. Under the scripts menu you will find the Preferences option. In this area you need to set the name of the email application your are using. The choose button will allow you to chose the email application.