Haven't seen precisely what you describe, Geert, but something similar. A brain-dead site started sending errors to the listowner-list address rather than the Errors-to: address. And it sent them with a From: field of listowner-list. Send something to that address and you get an "automagic" reply that the message has been submitted to the listowner. Since the From: field said listowner-list, guess who got all these nifty notes? When I tried to deal with it personally my messages started coming back as bounced mail, but with *my* address in the From: field (error message From: me To: me ). They'ld repeat the same thing every four to six hours. I never could get the people to say anything, but found an address that got results, after about two weeks. Every time I got one of those things I just bounced it back to that address. They never did say anything, but I did get the garbage stopped, once I found the right address. My impression was it was just a brain-dead system, nothing malicious. Douglas Douglas Winship Hays County, Texas [log in to unmask] Secondary AUTOCAT Listowner MEDLAB-L