How to connect two Exchange 2003 in different domain.

Posted on 2005-03-15
Medium Priority
Last Modified: 2008-01-09
I have 2 domain in different forest in each domain has 1 exchange 2003 for intranet use only.
How to setup Exchange 2003 server in each domain to enable user from domain1 can send mail to user on domain2 and vice versus.
Question by:njtd
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 2

Accepted Solution

michaellundgren earned 1200 total points
ID: 13542662
If it's only to the mail flow you're after this can be done pretty quick.

On Domain1 Exchange server: create a SMTP connector and add domain2 as address space.
Specify the connector to use a smart host for mail delivery and add the exchange server in domain2 as the smart host.

On Domain2 Exchange server: create a SMTP connector and add domain1 as address space.
Specify the connector to use a smart host for mail delivery and add the exchange server in domain1 as the smart host.

How to configure an SMTP connector:

Michael Lundgren

Author Comment

ID: 13543314
Thanks michaellundgren.
Can I add Exchange server in different domain to the same routing group?
If can, this solution can solve my problem or not?

Expert Comment

ID: 13544318
No, you can't add Exchange servers from different Exchange organizations to the same routing group.
Why do you need do have the servers in the same routing group?

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!


Author Comment

ID: 13598950
Hi michaellundgren.

I config SMTP connector follow your comment but when I send mail from domain1 to domain2 it show error "Unable to relay for user1@domain2.com".

I don't know what is problem.


Author Comment

ID: 13599658
When I try to enable "Allow messages to be relayed to these domains" I can send email with no problem but user1@domain2.com don't receive any email.

Author Comment

ID: 13614531
It seem the mail that I send remain in queues.
I don't know how to fix this problem.

Author Comment

ID: 13627988
After I diable Email Auto-protect from SAV 9, the problem never happen again.

Featured Post

Office 365 Training for Admins - 7 Day Trial

Learn how to provision tenants, synchronize on-premise Active Directory, implement Single Sign-On, customize Office deployment, and protect your organization with eDiscovery and DLP policies.  Only from Platform Scholar.

Question has a verified solution.

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

How to resolve IMCEAEX NDRs in Exchange or Exchange Online related to invalid X500 addresses.
This article will help to fix the below errors for MS Exchange Server 2013 I. Certificate error "name on the security certificate is invalid or does not match the name of the site" II. Out of Office not working III. Make Internal URLs and Externa…
In this video we show how to create an Address List 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 Organization >> Ad…
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…
Suggested Courses

777 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