Accepting 2 exchange email domains on 1 exchange server

So I have a couple questions for ya about exchange server hosting Multiple domains for emails. We acquired a new company and they currently get there mail from a hosted exchange server but want it to start going to through our mail server, now I am having Integra move over the MX records and DNS from Easystreet and pointing them at our mail server, however what do I need to do on my end to start accepting that mail traffic? Do I need to edit or add a new recipient policy? Do I have to create MX records on my internal DNS servers (if so how do I do that)? Or can I just go to the user profile in Exchange and add @abc.com as an SMTP address? Or do I need to go into Exchange System Manager and add a New Domain in the Internet Message Form under Global Settings? Please help me oh and I'm using Exchange 2003
Neogeo147IT Systems AdminAsked:
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Neogeo147IT Systems AdminAuthor Commented:
I got it all working here is what I did to get traffic to pass through from another domain name:
1.      First make sure the DNS servers are pointing to your mail server, also make sure your ISP provider is doing that and moving over the MX records for you mail to their DNS servers.
2.      Next you need to point your Domain Name to the new DNS servers of your ISP provider, you can do this by logging into your godaddy acct or whomever you use and select change name servers.
3.      Next go into your Exchange server and go to the System Manger and click on Internet Message Format and create a new domain in there with the new domain name your adding to the server
4.      Once that is done go to the Default Recipient policy and go to your existing policy and add the SMTP domain name into it but don’t let it update all your other users.
5.      Then go to your Active Directory and click on the users you want to have that new Address and go to the Email Address tab in there profile and create the new SMTP address using the domain name
6.      Now go back to the System Manger and go to the Recipient update service and update your recipient policy.
7.      Now send a test email to that new email address using an internal acct and then doing it with an external acct and see if mail is passing through.
Other things: if you use a barracuda firewall or spam blocker you may need to add that Domain Name to the Domain Manager or Always accept mail from tabs.
How to send emails from outlook with the option to select from both domains:
1.      First you need to create a dummy account in the AD for all the users that need that domain name.
2.      To create them you have to use a different username than what they currently have, so if there name is Alan Hickenbottom and his default username is AHickenbottom then the dummy account can be Alan H, once the username is created then go back in there and create a new SMTP address using the one with the new domain name, then set it as the primary and delete the other address. Then put a forward on that account to their default username so that all email address go to that account. Next you need to add the default username to the Send on Behalf  option too.
3.      Once that is all created you need to update your GAL, so go to your off-line GAL and select rebuild, this may take some time depending on how many users you have.
4.      Once the GAL is rebuilt go to your outlook account and click on Download Address Book and that will update your cached GAL in outlook, then make sure the “From” button is showing in outlook as well.
5.      Select Create new message and select the From button and search for your dummy username account, once you see it select it then type in the email address in the TO section and send it off, the recipient will be able to see that it came from Alan, H from SMTP address Alan@XYZ.com instead of Alan.Hickenbottom@ABC.com.
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thehagmanCommented:
Yes, you need to add another recipient policy, or add the new domain to an existing policy.
Your internal DNS server do not really need the MX records (you didn't need them for the first domain either, did you?) as your internal mail transmission is handled by Exchnage itself (provided you have suitable connectors between the possibly several Exchange servers). Only the "official" external DNS needs the MX records adjusted.

Here's one simple guide: http://www.howtonetworking.com/server/exchange2.htm
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Neogeo147IT Systems AdminAuthor Commented:
I will try that out and see if that works, actually the internal DNS does have a host file and MX record for our mail.abc.com so would I need one for the mail.xyz.com?

Also in there user profile under the exchange acct can they have both @abc.com and @xyz.com so in there outlook they are receiving from both and will they have an option to send from both?
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kdgoodknechtCommented:
In addition to creating the recipient policy, make sure you add the mailboxes and necessary email addresses for the users or the email will get bounced back.
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Neogeo147IT Systems AdminAuthor Commented:
how do I add the mailboxes and necessary email address if they already have @abc.com as there main mailbox?
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kdgoodknechtCommented:
Exchange allows you to add additional email addresses to accounts, manually or by policy. In Exchange 2003, it is on the E-mail addresses tab in AD Users and Computers.
It's been a while but I think the email addresses tab is only available if you have Exchange Management Tools installed on the DC, otherwise, you have to look on the Exchange server.
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Neogeo147IT Systems AdminAuthor Commented:
Ok so mail is flowing just not to my exchange server, I can send it internally but not externally, why is that happening, the ISP provider already can see the mail flow but it keeps bouncing back externally, I have created a recipient policy added the SMTP address to the existing users, what else do I need to do?
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kdgoodknechtCommented:
I would have to see the DSN (Delivery Status Notification) report for the bounced emails.
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Neogeo147IT Systems AdminAuthor Commented:
This is the correct way to do this
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