Your service is initially set up for users in a single domain. That domain resides in your initial user org. If you have additional domains that you want to filter, add each domain to an org.
WARNING: Follow these steps to add a domain before you change your MX records for that domain. If you change your MX records before these steps are completed, you may lose mail.
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Advanced: If the domain you’re adding resides on a different mail server than your existing domains, add a new email config and map it to that server (see Creating an Email Config). Then come back here and add the domain.
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Log in to the Administration Console and click the Orgs & Users tab. Click the Orgs link at the top to go to the Orgs page.
Choose the organization where you want to add the domain from the Choose Org list. If you are not sure which organization to use, choose the organization right below the email config. Email config organizations are marked with a gear 
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Note: If you have more than one email config, locate the right one for this domain (the one mapped to the domain’s server). Choose an organization below that email config.
Click the Add Domain link associated with this org.
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a.
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Enter your domain name in the New Domain Name field.
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b.
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Do not enter anything under Domain Alias. If you are adding a domain alias, you enter this information later.
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c.
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Click Save.
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If this domain has the same user list as an existing organization, you can change it to a domain alias after you create the domain. For information on how to do this, see Domains with the Same User List.
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5.
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In most cases, you add users at this point. For information on how to do this, see Add / Delete / Move Users.
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You do not want to filter mail for your users. For example, you may be starting a very small trial set.
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Change DNS MX records for the domain. For information on how to do this, see Activation Step-by-Step Guide.
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