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There are normally two methods for configuring this:
Single Domain - containing multiple Organizations, or
Multiple Domains - containing single Organizations
Single Domain Configuration:
When you set up Domino initially you need to enter two key settings during your server configuration:
The DOMAIN name, and
The ORGANIZATION name.
In a simple configuration, many Domino sites have the same Domain and Organisation name, in this scenario users sending Notes email will be in the format: name/organisation@domain; eg:
Nigel Ayen/company1@company1
One of Domino's best features is the ability to configure a single Domain and have multiple Organisations within that Domain. In your case, that sounds exactly what you require. Remember that the definition for a Domino Domain is:
A Collection of Servers and Users who share the SAME Domino Directory.
So you CAN have a single Domain, that contains many Organizations, where ALL of the Domain members can "see" one-another for mail-addressing purposes. An example would be IBM, where IBM contains several software organisations, so IBM users could be set up as:
Ed Brill/lotus@IBM
Don Wildman/tivoli@IBM
Jean-Louis Vignaud/rational@IBM
Even though the above members of the Domain belong to different organisations, they all SHARE the SAME Domino Directory, therefore address look-ups natively include all of the members.
Your FIRST organisation (eg:"company1") will be the one created when you configure the first server. Once the First server has been created, you use the Domino Administrator client, go to the "Configuration" tab, use the "Registration" tool to create your additional Organizations (ie: "company2" and "company3").
Once you have created the additional Organization certifiers, you can use the cert.id's to register users/servers under the appropriate organization. Remember that you will need to create a "cross-certificate" for each of the Organisation certifiers so that they "trust" one another, a Cross Certificate must be created in BOTH directions.
The neat thing about this configuration is the way you can set up the cross-certificates and the access to servers. If you only want "company1" users to access the "company1" server, and the "company2" users to access the "company2" server, etc ... you create the cross-certificates ONLY between the Servers' and change the Security tab of the server document so that only those members of "company*" (AND THE OTHER SERVERS) can access the Domino server.
Since all of the Servers and Users are members of the same domain, whenever anyone creates an email message they will be able to "see" ALL of the other users within the same Domino Directory.
To configure this you will need:
Cross Certificates
Multiple Domain Configuration:
This is where each of the servers are set up as "First Servers within the Domain", so each server has it's OWN Domino Directory, and it's OWN set of users.
It's a little trickier to configure, but you STILL need the cross-certificates to create the "trust" between the different servers, since they are STILL in different Organisations.
In addition, you can create replica's of each of the servers Domino Directories on each of the other servers, and then use either "Directory Assistance" or a "Directory Catalogue" to allow your users to address a message to a person within another Domain.
You can also create "Domain Documents" that identify the other Domain's and assist in (Native Notes/NRPC) mail-routing between the servers in the different Domains. You will also need to create Connection documents so that each of the servers know how to get mail to the other servers and when to replicate.
Configuring Domino Domains
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. . Configuring Domino Domains (~John Eklupulji... 22.Oct.09) 
