In every environment you may have different devices and appliances that may need to send email or notifications. This guide will go thru the process on how to configure your Linux server with Postfix Mail Transfer Agent. Thru the guide I will use Ubuntu as the Linux distribution for the demo.
1. Make sure to configure Exchange to accept email for relay. Check this post for how to configure Exchange 2013 to relay your mail for appliances.
2. Install all the required packages. ex. sudo apt-get install mailutils