The envelope (email icon) with a red dot under the manage column, denotes 1 or more contacts that have unsubscribed from your e-blasts (personalized bulk emails.)
During your next contact with these customers, you can ask for feedback to reduce future unsubscribes. e.g.; What was the main reason for you to unsubscribe? Too many e-blasts from our showroom? Content was not right?
If they decide to subscribe again, send them the following link:
https://www.showroomexchange.com/MaintainSubscription.aspx
Once they submit their address, Showroom Exchange will send an email with their profile. They can then resubscribe to your e-blasts.