Chand Will u please tell how to disable dns in IMC and to forward mail to u.s server only. And other issue is if we disable dns can these people communicate through mail locally in office?? please reply http://www.MSExchange.org/ Hi, I wanted to do the same for some users and could not find anything on this issue from anywhere. There is a way around in your case. CASE: I If every one is required only to send to ur US domain, then in IMC, you can control this behaviour. As I mentioned earlier to disable DNS use for delivery and forward all e-mails, forward all outgoing e-mails (for every domain)to ur US domain e-mail server. The configure ur US server not to route the e-mails destined for domains other than the us domain. This will be already there as an anti-spam feature. What will happen: All the e-mails sent to your US domain will be treated as inbound ones and will be accepted. All the e-mail sent to any other domain will be returned back to your server and then to sneders. Case:II If you want some of your users to able to send any where in the world, then install another server with IMC only. Route the allowed users to be able relay their e-mails to this server. Hope this assists!