When you have an unread message, a green circle appears on the envelope:
http://www.dominiqueloumeau.com/wp-content/uploads/2016/12/logo.png00http://www.dominiqueloumeau.com/wp-content/uploads/2016/12/logo.png2019-09-23 18:18:272019-09-23 18:18:27When you have an unread message, a green circle appears on the envelope: