Just recently I updated my Genesis eNews Extended widget to include an email icon in the widget title. Below are the instructions on how to add the icon.
1. Enqueue Dashicons
This tutorial is using the Dashicons to render the email icon. Dashicons will need to be enqueued prior to using them. You can check your functions.php file to see if you can locate them. If not, you can copy/paste the following code to the bottom of that file:
2. Add CSS to Your Style Sheet
Next, open up your style sheet (style.css). Copy/paste the following code before your Media Queries.
You may need to adjust the font size to fit your theme.