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EMAIL RETURNED UNKNOWN USER

New profile added in MS Outlook to exisiting user for one workstation.
New Mailbox set up in Exchange server to existing user.
New Domain registered and hosted--propigated--everything seems in order here.  (hopefully)
Old domain name emails come in from outside to new mailbox just fine.  

New domain emails sent from outside to us are returned unknown user.  Emails to existing mailboxes and new mailbox tested and both emails are returned.  (emails set up in both old mailbox and new mailbox)

What is missing?  How can this be corrected?

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EROO
Asked:
EROO
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1 Solution
 
What90Commented:
Have you set up exchange to add the email addresses (the new domain) to the user's account you want the new domain's email to be delivered to?


Which version of Exchange do you have?

Post back.
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EROOAuthor Commented:
Exchange Server 5.5

I have set up the new email addresses in the new mailbox properties--email addresses page.

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What90Commented:
Try following this:


Exchange Server 5.5
Let’s start with Exchange 5.5. In Exchange 5.5 you can create mailboxes from two places: User Manager for Domains and Exchange Administrator. You can create different containers for the new domains and create the new mailboxes under corresponding containers. After creating mailboxes, you must change the e-mail addresses of the newly created mailboxes. There is no automatic way, or a recipient policy as in Exchange 2000, to determine the e-mail addresses suitably. Then, switch to the Connections container and locate the Internet Mail Service there. Double click Internet Mail Service and switch to the Routing tab. At this tab, you must specify that the new domain must be regarded as “inbound”. That is, if messages targeting this domain are received, they are processed by the Exchange Server, rather than trying to relay the messages to their destinations.  


Taken from:
http://www.muratyildirimoglu.com/articles/exchange/Delivering%20MailServicestoMultipleDomainsinExchangeServer.htm
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EROOAuthor Commented:
When I go into the Microsoft Exchange Administrator--I can't figure out where the user manager is...I have been thinking that this must be what needs to be done..to add the domain name somewhere but I just need to know how to get there.

Please help if you can
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What90Commented:
User Manager for Domains is in Adminstration Tools and is part of NT 4 management tools. If your using windows 2000 then use the ADUC MMC.

Have you added the new domain name here?:
Then, switch to the Connections container and locate the Internet Mail Service there. Double click Internet Mail Service and switch to the Routing tab. At this tab, you must specify that the new domain must be regarded as “inbound”. That is, if messages targeting this domain are received, they are processed by the Exchange Server, rather than trying to relay the messages to their destinations.  
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EROOAuthor Commented:
I went to the connections container in MS Exchange and the routing tab was marked "inbound and outbound".  I also added the email domain name here, but I thought it odd that I didn't see any of our other domain names listed here.  

Im due in a meeting so I will continue this after lunch...THANKS so much...please don't give up on me yet... I have to get this done today.

THANKS
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What90Commented:
Hey EROO,

How did you go on this?
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EROOAuthor Commented:
Thanks so much for your help with this...was in a hurry and didn't go to the right connections folder...did the second time so your first advice actually worked...now I'll accept it.  

THANKS AGAIN!!!
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What90Commented:
No problem, just glad you're up and running!
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