2 Companies 1 Exchange

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Microsoft Exchange
Is it possible to set up email for 2 companies on one exchange box? i.e. company1.co.uk and company2.co.uk. I know the mx record for both domain names will ahve to point the the same IP address but how do you go about setting this up in exchange please? (Exchange2003 on Ws2k3)

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As far as I know this can be done.
I would point the 2 mx records to the smtp address of your exchange server/email gateway and configure your Exchange server to receive email for the 2 domains.
The server will then direct the email to the required users mailbox.

I have just tested this as I happen to receive email for 2 domains and it works.

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  • Sidzilla
    One thing to be aware of is that the reply address for your users will be from one company. For instance, if you have a sales rep who works for company1 and company2, his replies to email will be from user@company1 even if he gets the mail from his user@company2 address. You can set the reply address to be from either company1 or company2, but not both. The only way I know of around this would be to set up 2 mailboxes for the same person and have him check them under two distinct Exchange profiles.
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  • Jw
    Thanks for those responses. The 'reply to' issue is the problem as the people involved do not want any cross connection between the 2 companies (for commercial reasons). If you had 2 mailboxes would you have other complications like 2 names for one person in the GAL? (I suppose you could hide one of them from being displayed) But are there any other issues with the 2 mailbox scenarios? Also where do you actually duplicate the setup for company2 in Exchange System Manager? Thanks
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  • Jpdavey
    Are you having one person replying for both companies? You can always have them type in the specific from address in the From field in Outlook. That will force it to be from user@company2.co.uk even if their primary address is user@company1.co.uk. The only problem is if the person forgets to type their address in the From field.
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  • Jw
    Thanks - however when I put any other address in the from field I get a NDR.
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  • Sidzilla
    To add the set up for a second company, in the Exchange manager you go to recipient / recipient policies, double click on your policy and click on the email addresses tab. you can add a new domain to your existing policy there, and everyone should get the second email address. As I stated previously, the only way I know around the "from" problem is to set up a second profile for each user. I have a similar situation and hope someone else can get us both on the right track. Good Luck!
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  • Jpdavey
    Sorry, I did mean to mention the recipient policy part, and once you do that you can use the From field, but, yes, a second profile might be easier. The downside is that you will have to have another client access license for both Windows *and* Exchange to have another user and mailbox for that second profile.
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