Dear Sir/Madam: This is Dennis wang, Network administrator of INBAR ( International Network For Bamboo and Rattan) Beijing Office. We have purchased your product: ListServ 1.8d one and a half months ago. Now there is a small problem when we use this kind of software. I hope I can get some suggestions from your help. Now we have two NT 4.0 Servers, one is Mail server (Exchange 5.5), name is mail.inbar.org.cn (203.93.116.129) ; the other is Listserv Server ( runing Listserv 1.8d), name is Inbaris.inbar.org.cn (203.93.116.132). Our domain name is "inbar.org.cn". We also have legal IP address group. When I set up a newsgroup in the Listserv Server and add some subscriber in it, It seems like all the people from outside can use the newsgroup. for example: [log in to unmask] can send and receive informaiton with the newsgroup. But when I add a user belonging to our domain. for example: [log in to unmask], it just can receive message, but can not send message to the newsgroup. At the same time, an error accured:" cann't find out the recipient". I don't know what's wrong. Cound you please tell me how to fix this problem? Thank you very much. Dennis wang Network administrator INBAR