To start ExM, all you need to do is to go to the folder where ExM is installed.
If installed via NPM
cd ~/exm
./node_modules/.bin/startexm
If installed via Tarball
cd ~/exm
node index.js
Note: If you used port 80 and/or 443 for the ExM Frontend Demo Page, you may need to use sudo to start ExM.
Daemonizing
If you wish to run ExM as a Daemon, we highly recommend you install and use PM2. Alternatively, you may also use nohup.