Font Awesome icons are designed to be used in web and mobile applications. However, when used in email, they may not look as good as they do on other platforms.
<i class="fa fa-envelope"></i>
This code line is using the Font Awesome icon library to display an envelope icon.
Icons in Font Awesome
There are a few icons that come with Font Awesome in HTML. You can use them by including the font-awesome css file and adding the appropriate class to your elements.
The first icon is the icon for a link. To use this, you would include the font-awesome css file and add the class link to your links:
The second icon is the icon for an image. To use this, you would include the font-awesome css file and add the class image to your images: