Exchange 2016 / 2013 Adding a New Email Domain

KB ID 0001297 Dtd 04/04/17

Problem

On EE this morning someone asked this question and I realised I’ve never written it up. So If you want to add a new domain to an already working Exchange deployment how do you do it?

Solution

Firstly, you need to have purchased the new domain name, and have the DNS records setup properly  for the new domain name. See the following article;

Setting up the Correct DNS Records for your Web or Mail Server

Add the New Domain Into Exchange 2016 / 2013

Log into Exchange Admin Center > Mail Flow > Accepted Domains > Add.

Exchange Accepted Domains

Add a sensible name > Enter the new domain name > Select Authoritative > Save.

Add a New Domain to Exchange

Create a User Mailbox For the New Domain

If you only have a few users to setup you can do them manually within the Exchange Admin Center  > Recipients > Mailboxes > Add.

New Mailbox Exchange

On the properties of the new recipient you can edit the email addresses associated with it.

Exchange Additional Email Addresses

Change and add accordingly.

Exchange 2016 Additional Email Addresses

Remember for individual users to untick the ‘Automatically update email addresses based on the email address policy applied to this recipient’ > then change the Clients ‘Reply address’ > OK > Save.

Exchange Change Senders Reply Email Address

Create an Email Address Policy And Apply It to an OU

The procedure above does not scale well if you have a lot of users to allocate a new domain to, so you can write a new email address policy, and apply it to a particular OU, then create/import your new users into this OU, mail enable them, and they will all get the correct Email addresses.

Mail flow > Email Address polices > Add.

Exchange 2016 Address Policies

Add a new policy with the email  format you require;

Exchange Address Policy Per OU

Repeat to add multiple email address formats > Save.

Email address policies

Scroll down to where you want to apply the  policy to and select ‘recipient container’, (because OU would have been to simple).

Apply Exchange Policy to an OU

Select the OU with your users in > OK.

Note: You don’t have to use OU’s you can use other things like ‘department’ which will get read from the users AD object.

OU Based Exchange eAddress Policies

OK

Apply Address Policy Warning

With the policy selected  > Apply.

Force Email Address Policy UpdateNow go and have a few cups of coffee, and your users will get the new policy.

Different Email Addresses Per OU

Related Articles, References, Credits, or External Links

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Author: PeteLong

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