>(1) Do I presume correctly that if the WELCOME file gets bounced in this >manner, that list messages will be bounced also? Yep. >(2) If the address is valid as given, is there any other way around >this? Well, the way to find out whether an address is valid is to try to use it to write a test message. If it bounces, it's not valid :-) So, what you need to find out now is why it's not valid... Eric