About the previous problem, the list owner now says the messages are getting through to the list but not getting through to the problem address. I can contact the address directly and receive mail back from them fine. But if a list message goes out to them, then it tries to route itself through mcmedia which does not have an MX record for the domain of the subscriber. am I looking in the right area if I start asking questions about how the listserv backbone of servers works and if this particular server is on that backbone? thanks Debra