bounces from messages send to this list

Hi, I'm getting LOTS of bounces whenever I send a message to this list. This is the only lists from which I'm experiencing this kind of problems. It's very annoying to receive multiple bounces because of one message. Some are caused by misconfigured mailserver (solfix.net is a very good example). Others are caused by people who forget to unsubscribe whenever they get a new email addess.. As I said before.. this is the only list I'm experiencing this kind of problems.. so clean up if you're one of those people mentioned above.. Or unsubscribe until you've got it all figured out.. Thanks, B.