Multiple domain support on exhange 2k

You can set up two Exchange sites (one for each W2K domain), and join them together in one Exchange organisation.

If your intention is to be able to route mail adressed to username@xyz.com to your Exchange server that can be easily done.
- Define a MX-record for XYZ.COM in DNS pointing to your Exchange server
- Configure Internet Mail Service on the Exchange server to accept "xyz.com" inbound.
- Define the mailboxes with SMTP adress xyz.com

i have installed an exchange server in a child domain without any problem, the tricky part is to make sure that the user you are using to install it is an exchange full administrator.
Once you install the exchange both exchange will be in the same organization, then you will have to add in the recepient policy the domains that each exchange is going to accept email for, of course make sure to adjust the DNS with the right records

Related to this subject i has a question too, maybe you can help me,

exchange child domain
I have a domain an a child domain, in the main domain there is an exchange server, in the child domain there is also an exchange server.

1. I want the users in the first domain to be able to access the exchange in the child domain
How can i make posible for the user of the main domain (mydomain.com) to be able to login in the child domain (child.mydomain.com), using mydomain.com user name and password?

2. My intention is also, shout down the main exchange to rebuild it but meanwhile have the other MTA (in the child domain exchange server) distributing the incoming messages, will that work? will the second exchange distribute the incoming emails while the others is being rebuilt.

thanks all

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