Email messages "No Longer a Member "

Club 4609 - NY Harbor Toastmasters
4609.toastmastersclubs.org/
Email messages "No Longer a Member" are generating for members without them selecting the link to remove them as members.
I unchecked the box in the Email Security Tab trying to prevent this message from generating again.  Please advise if their is a clinch in the system or if 
there is something else I need to do.  Thanks you, Beatrice Smith

Make sure they are not using saved links that have anything after the .org