Exchange Server Cookbook: For Exchange Server 2003 and Exchange 2000 Server

2017-07-07 02:10:07

Recipe 7.18. Accepting Mail for Multiple Domains

Problem

You want the recipients in your Exchange organization to be able to accept mail for an additional domain without having to configure separate secondary addresses for each recipient.

Solution

Using a graphical user interface

Open the Exchange System Manager (Exchange System Manager.msc).

Expand the organization Recipients Recipient Policies.

Right-click the desired policy and select Properties.

Click the E-mail Addresses tab.

Click New. Select SMTP Address and click OK.

Fill in the Address field as shown in Figure 7-1. Be sure to include a leading @ before the domain. Click OK.

Check the checkbox beside the new SMTP domain to activate it.

If you want the new domain to be the primary (default) domain for all recipients, select it and click Set as Primary.

Click Apply. When you are asked if you wish to apply the change to all recipients, click Yes.

Click OK to close the property sheet.

Figure 7-1. Adding a new SMTP domain to a recipient policy.

Discussion

This is a straightforward task. By default, your Exchange recipients have a single SMTP domain associated with them (their Active Directory domain). By modifying the default recipient policy or creating a new recipient policy, you can add additional SMTP domains to all recipients, allowing your users to share a common domain namespace. This is commonly used to set an organization's recipients to use the parent domain when Active Directory has been configured in a subdomain. However, it will trigger a rebuild of your offline address lists, which may, in turn, cause a spike in synchronization traffic to your clients.

Although you can easily find the recipient policy information in Active Directory by looking in the CN=<Policy Name>,CN=Recipient Policies,CN=<organization>, CN=Microsoft Exchange,CN=Services DN of your domain's Configuration naming context, you should only make changes to it via ESM. The Recipient Update Service will do the work of applying the change policies to your existing recipients.