Tracking outbound links is a nice to have feature in every Google Analytics implementation, and making it work with Google Tag Manager is very easy.
In short, what we want to do is track links that are being clicked on any given page and then send an event to Google Analytics if the link goes to any page outside current domain, making it external.
This post will introduce you to theĀ Link Click Listener in Google Tag Manager and how to configure it to listen to exactly what we want.