Watch this video to get an indepth look at tracking email link clicks (aka mailto:) on Google Tag Manager. I go over a few examples such as:
1. How to track a plain email link click
2. How to track different email link clicks on one page
3. How to track using the same email link, for different contacts
BONUS:
4. Tracking email link clicks only on MOBILE.
Alert Box sample code:
https://jsfiddle.net/bhg30uex/
Sample Javascript code for Tracking on Mobile:
https://jsfiddle.net/sve0bgdh/2/
As always, leave a like or comment if you need any help!