$ sudo apt-get update
$ sudo apt-get install fusionforge-mta-exim4 

fusionforge-mta-exim4 is installed in your system.

Make ensure the fusionforge-mta-exim4 package were installed using the commands given below,

$ sudo dpkg-query -l | grep fusionforge-mta-exim4 *

You will get with fusionforge-mta-exim4 package name, version, architecture and description in a table

fusionforge-mta-exim4 package basic information: