My client has MS SBS 2003 server with SP2 and Exchange SP2 (Version: 6.5.7638.1). The administrator/mesage sender doesnot receive noticiation of undelivered messages. But he receive undelivered notification when server is reset/restarted. There are no error logged in event log. The server also have Mail Security for Microsoft Exchange 2000 Server/Server 2003 version 126.96.36.199.
Sorry I don't have much information.
Anyone with any ideas??