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Exchange 2010 enabling email for additional domain

Posted on 2012-04-02
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We have exchange 2010 with one domain  "mycompany.com"  We are doing a joint venture project for a long period of time and set up a new domain for these couple companies and us.  Let's call it "myjointventure.com"  I set up the DNS for myjointventure.com to come to me .  I want to have employees and non-employees have the myjointventure.com email address and the employees would keep their  "mycompany.com" address.  The non-employees obviously have their own email address too, "theiremail.com"  What is the best way to allow these non-employees to have an email address on my exchange server but yet provide the maximum security for my network AND let them have functionality and do their job??

Should I move the domain to google apps?  I'd rather not pay them $6 per month per mailbox.  Thanks experts!
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Question by:atrevido
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Adam Brown earned 500 total points
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You should be able to have everything working on your exchange server. I'm just a little confused about your purpose. Can you give some more details here? Do you have multiple companies converging onto your environment? Do these companies have their own email infrastructure? If that's the case, you can create a mailbox for all those users and assign it the myjointventure.com email address, then create a contact for theiremail.com and have the mailbox in your environment forward mail to them.

If they are all going to use only your exchange environment, you can configure theiremail.com as an accepted domain on your environment and assign it to whichever mailboxes you need to. You can have your exchange server receive mail for as many domains as you want, you just need to make sure those domains are delivering mail to your server and configure a mailbox for each user that has that address assigned.
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by:atrevido
ID: 37798049
These 20 - 30 people are temporarily going to be working with our people on a project.  Temporary for years....The 2nd company does have their own exchange infrastructure.  I have set up option 1 you gave and it works nicely and then they said "how do we distinguish sending mail from our 2nd email address"?  Good question - hence my question here.  Normally in outlook you can hit the drop down box for FROM: and say which account you are sending from but how do I configure their outlook from a server standpoint?  manual configration and add a 2nd account? Or do I just have them use OWA(which they won't be happy with)?
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by:Adam Brown
ID: 37798197
If they want to send from the joint email address, you would configure those mailboxes so the only email address that is applied to them is the joint address. From there they would actually have to use OWA or connect to the mailbox with outlook to send from that address. If they have outlook 2010, they can connect to their Exchange mailbox and the one in your environment without any issues, but if they don't they would need to use OWA. That's the easy to configure way.

It's *possible* to set it up so that each organization can assign the joint email address to their own mailboxes. This would be set up as an Internal Relay Domain. It's not something I understand fully, but http://technet.microsoft.com/en-us/library/bb676395.aspx has setup information. I *think* the way it works is any emails to recipients that aren't in your domain will get sent through the connector assigned to work as the Internal Relay. At any rate, it's an option to look into. That said, any time you have two emails that you can potentially use as a FROM:, you have to configure it so that each email address has it's own mailbox. That is, if Jen has a mailbox on your exchange server, and can be jen@mycompany.com as well as jen@jointventure.com, you would have to create a mailbox that has jen@jointventure.com as the primary SMTP address and then give jen@mycompany.com send as permissions to that mailbox.
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by:atrevido
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Thanks!  Outlook 2010 and your first solution solved it.
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