Hello, I would like some help on design for smtp domain name consolidation, where we want to keep the old SMTP domain email addresses. Site 1 = Windows 2008 R2 Domain Controller, Exchange 2010 Hub Transport and CAL Server, Exchange 2010 Mailbox Server. Internal AD= site.company1.com SMTP domain name = company1.com Site 2 = Windows 2003 Domain Controllers, single Exchange 2003 server. Internal AD= site.company2.com SMTP domain name = company2.com Newdomainname.com SMTP will be delivered to site 1. Both sites will use this as default, but will retain their old SMTP domain names as is. Can we use a trust between the 2 AD domains and configure Exchange 2010 to route email to site 2 if the email address exists in site 2, otherwise NDR? Or is there another way to do this efficiently? With thanks, Adam

Hello Yes you can configure send connector between different forest to communicate with exchange. http://technet.microsoft.com/en-us/library/bb123546.aspx try this article Thanks Mhussain Thanks Mhussain

Hello You can use the EMC or the Shell to configure Send connectors and Receive connectors to enable cross-forest communication. To establish direct mail flow between servers that are running Microsoft Exchange in different Active Directory forests, you must configure Send connectors and Receive connectors. Here is the article. http://technet.microsoft.com/en-us/library/bb123546.aspxThanks Mhussain

Hi Mhussain, Thanks for your reply. I've read the article and appears it is intended for environments without a common SMTP domain name? Cross-forest communication is part of my requirement. If email from the Internet is delivered to Site 1 Exchange server, is it able to be configured to send email to the site 2 Exchange server via smtp IF the recipients email address is assigned to one of the users in Site 2, accessible via a trust? Thanks, Adam

Hi Datemerge, I would like to confirm whether these two site in the same forest? If it does, so everything would be easy. Via GC, message could be deliver to the site2. If they are not in the same forest, when the message arrive, they would be firstly sent to the Site1, here you need create a sender connector, and configure as internal relay. Then the message could be relay.

Hi there, They are not in the same forest. Please walk me through it.. So Exchange 2010 will automatically check for the email address in the remote site? The only things we need are the trust and internal send connector?

Hi Yes, you can use Exchange 2010 for this purpose Setup the domain2 as internal relay domain, and a send connector to your domain2 Also setup the trust between the domainsJonas Andersson MCTS: Microsoft Exchange Server 2007/2010 | MCITP: EMA 2007/2010 | MCSE/MCSA Blog: http://www.testlabs.se/blog

Hi Jonas, Sorry to be a pain, but I need to be clear that it is only one external domain name which will be shared across both sites which will be connected by a forest trust (the new parent company wants both operating companies to start using a single external domain name for emails). Exch2010 will route emails via the send connector, only if the email exists in the remote site? Thanks.

Yes, if the address not exists in the "Site" where you have the exchange 2010 server. And you are not a pain, the forum should be used for questions just like this Is there any plan to migrate the domain into one site or they should always be splitted?Jonas Andersson MCTS: Microsoft Exchange Server 2007/2010 | MCITP: EMA 2007/2010 | MCSE/MCSA Blog: http://www.testlabs.se/blog

Hi Jonas, They will always be split across physical locations (4000km apart), but perhaps down the line they will be migrated to a single AD domain. One thought; will the Exch2010 server simply send any email, that can't be matched to a local email address, through the internal send connector? Or only if the email address actually exists in the remote forest? I don't know a great deal about LDAP and trusts and caching, so am also wondering if it would be worth having a DC of the remote site available locally to the Exch2010 server? Adam