We have 2 MSX Servers. MSX55 was setup before and MSX2K was setup later. The issue is: 1. When we open a new account in Exchange 2000 that account can receive mail only from our domain internally not from outside (Internet) 2. When we want to open an alias for an account, it works internally. As a quick remedy, we care creating user in MSX55 and migrate them to MSX2K and it works fine. Any ideas?? Thanks.