Sign onto Zoho Business and create an organization. Lets see how to go about setting up an organization..
To Create an Organization
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Click the Create Organization link given at the top of the main page.
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Enter a Name for the organization in the respective text field.
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Click on "Create Organization" button.

Adding a Domain
If you already own a domain then add it to Zoho Business and verify the domain.
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Click on Add Domain
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Validate your domain using the CNAME or the html method
Click here to know more about adding and validating domains.
Adding Users/Inviting Users
You can invite your friends and colleagues to join your organization.
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Click on the Control Panel and select Users
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Click on Invite User and enter the email id or invite users in bulk
The users are added to your organization once they approve of the invitation. You can also import users to your organization to directly add them as organization members.

Domain based Emails
Send and receive domain based emails for your organization members by enabling your domain for mail hosting.
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Click on Mail Administration on the Control Panel
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Add email aliases
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Enable your registered/added domain for mail hosting
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Your organization is now set up! You can create groups, add applications for your group members and do so much more..