Need some advice on how to route emails for a specific ou in an exchange 2010 organization

Posted on 2012-03-11
Last Modified: 2013-08-31
Hello Experts,

We are currently running exchange 2010 in a dag environment consisting of 3 mailbox and 4 cas/hub servers. we are currently host 10 email domains and all our external emails go through a smart host connecting to an external spam filter.

our company bought a company, 3 months ago. In order for the employees at xyz to be able to use abcd email addresses. We created contacts for them i.e. forwards to

All of these contacts are routing through the smart host that connects to the external spam filter.

They want me to look into seperating the xyz users to be able to send emails using dns instead of using the smart connector.

Problem is I need to make sure all of the other users at abcd are able to route emails using the smart connector since they use the same email domain

we also have a site to site link with them now. they are also running exchange 2010 on their end.

Is there a way to route email using a specific OU or creating a federation trust will help in this matter.

Thank you,

Question by:mshaikh22
  • 5
  • 3
LVL 25

Assisted Solution

-MAS earned 500 total points
ID: 37708515
Not sure I am completely understand your req.

If you want to configure mail flow between server do as below

In exchange
Go to on exchange 2010 -> EMC -> org config -> Hub transport-> Accepted Domain
Create a new accepted domain '' configure as  externl-relay.

Go to on exchange 2010 -> EMC -> org config -> Hub transport-> send connector edit your current send connector and make it use the IP of exch2010(  as smart host relay

Go to on exchange 2010 -> EMC -> org config -> Hub transport-> Email Address Policies
Update the email address policy so that all users will have two email addresses (e.g. and

In exchnage
Go to exchange 2010 -> emc -> server config -> hub tranposrt -> create a new receive connector make it accept connections from the IP of exch2010( and allow relaying on it

All the mails will receive in and forward to
when an email from it will send to to send outside.

Assisted Solution

mshaikh22 earned 0 total points
ID: 37708539

Sorry to confuse you, 200 people from emails need to be relayed using dns and the rest of the 800 people still need their abcd emails relayed throught the existing smarthost .

We do not need to use email addresses at all.
LVL 25

Assisted Solution

-MAS earned 500 total points
ID: 37708566
Both site has exchange servers?

Both exchange has a public IP?

Assisted Solution

mshaikh22 earned 0 total points
ID: 37708589

both sites are external sites and there is no trust between them.
NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

LVL 25

Assisted Solution

-MAS earned 500 total points
ID: 37708782
Then do what I mentioned in the first post.

If you do not want email address, Remove the from the accepted domains from the exchange server of site

Please let me know if you are not clear.

Assisted Solution

mshaikh22 earned 0 total points
ID: 37711006
Hi Abbasift

Sorry to confuse u again. email domain is not hosted at company email domain.

let me start again

company a (Exchange 2010) is abcd has 800 employees.
company b (Exchange 2010) is xyz - 200 employees

company A (abcd) routes their email through an external spam filter.
There is no trust between company a and company b

A request has come in to have email address which consist of 200 xyz external contacts (abcd contact forward to a xyz email addresses) and 600 internal mailboxes to be able to communicate with each other internally instead of using the external spam filter.

Is that possible?

Accepted Solution

mshaikh22 earned 0 total points
ID: 37711181
Sorry, I didn't read your first post properly, I will look into the suggestion in your first post and let you know if its working. Thanks a lot.


Author Closing Comment

ID: 39454752
Issue was resolved internally by creating contacts on both end which allowed emails to be routed.

Featured Post

[Webinar] Disaster Recovery and Cloud Management

Learn from Unigma and CloudBerry industry veterans which providers are best for certain use cases and how to lower cloud costs, how to grow your Managed Services practice in IaaS clouds, and how to utilize public cloud for Disaster Recovery

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Following basic email etiquette rules will help you write a professional email and achieve a good, lasting impression with your contacts.
Learn to move / copy / export exchange contacts to iPhone without using any software. Also see the issues in configuration of exchange with iPhone to migrate contacts.
In this video we show how to create an Accepted Domain in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Mail Flow >> Ac…
The video tutorial explains the basics of the Exchange server Database Availability groups. The components of this video include: 1. Automatic Failover 2. Failover Clustering 3. Active Manager

910 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now