I chose the basic email icon that is in the WP dashicons, but there are a couple of dashicon alternatives. And certainly, you could modify this code snippet to use any type of image/icon, such as font awesome. I used the WP dashicons because they are already loaded.
Adding the icon itself (without the link) is nothing more than adding the following span tag to the user profile:
<span class="dashicons dashicons-email"></span>Adding to the user list view can be done with the wpmem_ul_user_rows filter. There is a verbose example below.
[snippet slug=add-dashicon-to-user-list-row-entry lang=php]
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