Why are people so god-damned stupid? Someone decided they wanted to unsubscribe from the film club weekly newsletter mailing list. This list is opt-in, so this person managed to subscribe themselves, but apparently clicking the unsubscribe link at the bottom of EVERY LIST MESSAGE was too complicated and they just sent a message to the list (which bounced). Don’t worry, you lazy bastard, I just volunteer my time running this club, but I’ll do your work for you.
you should create a new website, “Mailing Lists for Dummies” and direct such people there.