I have a tricky request from a customer. He has an exchange 2010 organization already set-up in country A. Now they want to open a new office in country B with ~200 users for country B. The active directory options are open as countryB can have a seperate forest or child domain.Probelm is with the exchange design. All users in countryA and countryB should have the same e-mail address, user@company.com. The problem is that they don't want the messages for users in countryB to be routed through the exchange servers in countryA because they say that the internet bandwidth of the office in countryA will be overloaded!! How do I make sure that all users in CountryA and CountryB have the same e-mail addresses (user@company.com) while ensuring that messages for one destination does not get routed through the other destination. As far as I know e-mail must reach one destination (countryA or countryB) and then get routed after that. Any ideas anyone?

The MX record of the Domain Specifies which mail server email will be sent to. Peter

of course I know that mx record defines were tha mail is sent. but is there a solution to the customer requirement that I described?

Hi, I think you have two issue. 1. Country A and Country B should appear as if they come from same organizations. It is easy to do it via Address rewriting technology. 2. >>The problem is that they don't want the messages for users in country B to be routed through the exchange servers in country A because they say that the internet bandwidth of the office in country A will be overloaded!! I would like to divide it into two scenario. a. Outbound message send from country B not be routed through Country A I think it can be achieve. You could install an Edge role as a smart host of country B. The Edge role can rewrite the address. b. Inbound message send to country B not be routed through country A I haven’t found any way to receive e-mail send to country B if the mail not be routed through Country A. Because you have registered an MX record points to the Edge role in Country A. You can’t register the same MX record points to the Edge Role in country B. Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

thanks jerome, it is only the last part that was my issue, i.e. "inbound messages to countryB". I know that outbound messages are not an issue and can be easily managed. My own gut feeling was that there is no solution to this demand. I will probably tell the customer that he has no choice but to route through countryA.

thanks jerome, it is only the last part that was my issue, i.e. "inbound messages to countryB". I know that outbound messages are not an issue and can be easily managed. My own gut feeling was that there is no solution to this demand. I will probably tell the customer that he has no choice but to route through countryA. I think so.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.