How to add another email domain to just a few users not all in exchange 2013

I need to add a new email domain that we just setup in Exchange 2013 but now I need to just assign it to just a few users and not all of the exchange users.
Do I do this by creating a new email policy and if so once I have the new email policy created, is there granular settings for just adding a couple of users to it and not all users?
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vmichAsked:
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MaheshArchitectCommented:
You can add new accepted domain with exchange and add new email address policy apart from default policy and can control recipient members based on condition
https://practical365.com/exchange-server/adding-new-email-addresses-multiple-mailbox-users/
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vmichAuthor Commented:
Yes but can I add in just say like 2 or 3 users names.
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Eric WoodfordSoftware Systems Specialist 3Commented:
Once you have the accepted domain configured in Exchange you can go to each recipient and add it manually to their proxy addresses. If this group is going to be dynamic (changing regularly) creating an email address policy will make sure it's automatically added to new mailboxes, or changes to mailboxes, when it occurs.

For example, apply Email Address Policy where CustomAttribute1 = "abc"
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mbkitmgrCommented:
On my Exchange server
  1. Add the accepted domain
  2. Each user who is an employee of say ABC Co or XYZ Co or EFG Co, has the company name in the Company Field in the User Account in AD
  3. Email address Policy - Queries AD for the company name and Department to assign the email address to the correct users (We host 5 email domains )
  4. I have Separate disclaimers for each Email Domain eg one is an Indigenous Org, so they have two paragraphs appended to outgoing emails - disclaimer and an acknowledgement of the custodial owners of the land, it queries the GAL to assign based on email address

Clearly this is more info but shows how far you can go.
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vmichAuthor Commented:
Ok I added the new auth domain and assigned it to a couple of users, but when I send email to them via the new domain, they never get the email. Is there something else I have to do with the new domain like something in external dns or inter dns?
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vmichAuthor Commented:
I guess I have to reach out to our mx host company to create another mx record and point it to our external IP of the exchange server, is this correct?
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mbkitmgrCommented:
Yes, you need the relevant MX record that points the domain name to the IP address of your server
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vmichAuthor Commented:
Add the new domain on ext dns and then make changes to ext DNS
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