Good morning!I have a question about exchange that might probably be obvious to a lot of people but it's not to me since i'm not working with Exchange a lot.I am actually seting up an environment that will include Exchange Servers located in 6 differents sites. All the sites are part of a single domain/forest so they share the same Exchange Organization.I would like to acheive to isolate all exchange servers since they are use only for "local" communication in all sites and don't need to be able to send email to others sites. The fact is that the wan-links are terrible and in no occasion we want to have email going from a site to another with attachments.Actually, the Exchnage environment is pretty basic and mail are going from a server to another without a problem.Can someone light me on this problem so I can make sure that Exchange servers permit mail in their own site without being able to send/receive mail from other sites?Thank you,Luc

Hi Luc,A quick response is, to limit the message size between AD sites to stop flowing large attachment or mails between different AD sites in case you have low bandwidth connections between...In Exchange 2007 SP1, you can configure message size limit on IP Site link.Exchange 2007 - Message Size Limitshttp://exchangeshare.wordpress.com/2008/04/24/exchange-2007-where-to-set-message-mail-size-limit/Planning to Use Active Directory Sites for Routing Mailhttp://technet.microsoft.com/en-us/library/aa996299.aspxI assume that you have DC/GC and Mailbox, CAS & Hub transport server roles of Exchange 2007 in each AD sites. Moreover you need to consider internet mailflow also in this situation...Amit Tank | MVP - Exchange | MCITP:EMA MCSA:M | http://ExchangeShare.WordPress.com

Thanks Amit for your quick answer!Actually, I'm using Exchange 2003 SP2.There's no Internet mail flow since the Exchange servers are only use for internal communications.I really need to block email communication between servers and not "lower the workload"I actually found a way to do such thing, may I have your advice on that?I configure different routing group in which I setup a SMTP connector. The SMTP connector of each group is configure to have his scope restricted to the routing group only. I spread all my Exchange Servers in their own routing group. Is this a way to avoid email from beeing route to the different servers? Also, I see that when i'm doing such configuration, i'm unable to move mailbox from a server to another, is there a way to adding this possibilities along with blocking email from being transfer from a server to another?thank youLuc

Yes, routing group feature can be used to restrict the mail transfer. But I would suggest using Routing Group Connector (RGC) rather than SMTP connector In the lab, Ive blocked the mail flow between different routing groups with RGC (Set Allowed sizes as 0KB) and still able to perform the Move-Mailbox task. Whats error info in the task report during Move-Mailbox task? Can you post it at here? Note: The report can be opened automatically after the mailbox move is complete. Also, this report is in XML format and is saved in the X:\Documents and Settings\Profile\My Documents\Exchange Task Wizard Logs folder And please also check the application log, see if theres any related event Does all exchange servers stay in the same administrative group and whether exchange is in mixed mode or native mode? Please describe more about the exchange topology References: Understanding Mixed and Native Modes Moving Mailboxes Moving mailboxes in Exchange Server 2003 Moving Mailboxes with the Exchange 2003 Move Mailbox Wizard

Hi James!Thanks a lot for those uselfull infos.I've already change my SMTP connector for RGC as you mention. I have read about that recently and I've made de change.Next, I will implement, as you propose, the 0kb limit in my RGC as you suggest and let you know about the result.I'll let you know about futher errors with "move mailbox" thing if it still occured. Otherwise, I think it's pointless since your solution might resolve the issue.I'll be back soon to let you know about the results.Thank you so much.Luc

Hi James,Your solution works like a charm!I set a limit to 0KB on my RGC and I receive Admin mail saying that the user is not autorize to send email to the destination recipient. Which is great!Next, I perform a mailbox move from a RG to another and it works perfectly.Your contribution to this thread was excellent and your solution straight in line with the goal I was trying to reach.Thank you very much for your time,Luc

J Glad you solved it!!