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Should I have to create or separate servers or active directories for the single exchange server or I can use the single server(Virtual Machine) with multiple domains in the exchange server?
If your requirement is to have users sending emails with different domain suffix, you can use a single Exchange server and add these domains as accepted domains in Exchange Admin Center, then create and apply email address polices to these users.
Below is an example with the general steps.
Scenario:
- The Active Directory domain is domain1.com, by default mailboxes created in Exchange have domain1.com as domain suffix
- I want to add xyz.com as an additional email domain and have some mailboxes have xyz.com as domain suffix
1.In Exchange Admin Center, create an accepted domain named xyz.com
2.create an email address policy
select xyz.com as accepted domain
click save and back to the former page, in below settings click "add a rule" to custom which users the policy would be applied to (in this example the rule is applied to the users in the "xyz.com" organization unit in Active Directory)
in xyz.com OU:
3.Once the policy is created, click "apply" to apply the policy to the users (in this case apply to user03)
You can see user03's email address changed from user03@domain1.com to user03@xyz.com.
Before:
After:
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