Exchange 2007 - route mail of unresloved recipients to smart host

co_ol used Ask the Experts™
I have a SBS 2008 Standard server with POP mail. Some of the recipients have a pop account but are not part of the domain. Sending email to those email addresses fail. Error:The recipient's e-mail address was not found in the recipient's e-mail system. In Exhange 2003 I was able to just tick a box in the smtp connector and route the mail to a smart host.
All I need is outgoing mail to be routed to a smart host if recipients are not found. I have tried to create another send SMTP Send connector for the domain and sed to smart host. That did not fix the problem. I must be missing something else. Anybody can help me with more detailed instructions since the articles on the net make no sense to me.
Watch Question

Do more with

Expert Office
EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®

I think you have to change it to internal relay domain or external relay domain - take a look at these resources:

Understanding Accepted Domains
Q: How do you share SMTP domain names between an Exchange 2007 environment and a foreign mail system?
change the accepted domain type.

In the past when I have done this I used the phrase smtp namespace sharing.


Thanks for your reply. Do I change the existing authoritative domain to an internal relay or do I have to create a new domain and make this an internal relay. Do I also have to setup a new send connector for the domain to forward the unresolved emails out. Sorry for the questions but this server is live and I have to make sure I know what I'm doing. Thanks in advance
I took the following steps to overcome the issue: Exchange Manager / Organization Configuration / Hub Transport / Accepted Domain / Windows SBS External Domain ( go to Properties and change to "internal relay" and save.
Go to Send Connector Tab and create a new send connector for enter the smart host and save.  
This will allow you to route unresolved recipient to the smart host

Do more with

Expert Office
Submit tech questions to Ask the Experts™ at any time to receive solutions, advice, and new ideas from leading industry professionals.

Start 7-Day Free Trial