Add a secondary domain to your organization

Here are the steps for creating two SMTP entries.

There could be several reasons for employee e-mail address changes--Companies acquire one another and some change their names. No matter the reason, upper management will probably want the e-mail addresses for company employees to reflect the actual name of the company today. You, as the e-mail administrator, know that these kinds of changes don't take place overnight. You need to allot time to allow e-mail to be delivered to users at both their old and their new e-mail addresses, but at the same time, you don’t want users to have to check multiple mailboxes for new mail.

Fortunately, Exchange has an easy solution for you. Here are the steps for creating two SMTP entries:

1. Open the Exchange System Manager.
2. Go to Recipients > Recipient Policy.
3. In the right-hand pane, right-click the Default Policy and choose Properties from the shortcut menu.
4. Select the "E-mail Addresses (Policy)" tab.
5. Click the New button.
6. From the New E-mail Address window, choose "SMTP Address".
7. On the SMTP Address Properties window, in the Address box, enter your new domain preceded by an at (@) sign.
8. Click OK.
9. Enable the new mail address by selecting the checkbox next to the new address.
10. Back on the main ESM window, right-click the Policy and choose "Apply this policy now".

Now, when you look at the details for a user, you will see two SMTP entries.

Configure the Internet Mail Service for multiple domains

More businesses register multiple domain names than ever before because it's cheap and easy to do. Some users have several e-mail addresses, all with different domain names but delivered via the same mail server. If you aren't hosting more than one domain on your Exchange server, you probably will in the near future.

Follow these steps to configure the Internet Mail Service (IMS) to support multiple domains in Exchange 5.5:

1. From the Exchange Server Administrator program, navigate to the Connections container, and double-click the Internet Mail Service object.
2. From the Internet Mail Service Properties dialog box, select the Routing tab, and click Add.
3. Enter the domain you want to add in the E-mail Sent To This Domain field, select the Should Be Accepted As "Inbound" option, and click OK.
4. Repeat Steps 2 and 3 for each domain you need to support. When you're finished adding domains, click OK to close the Internet Mail Service Properties dialog box.
5. Stop and restart the Microsoft Exchange Internet Mail Service to make your changes take effect.

In order for mail from the new domains to be delivered to your Exchange server, you'll need to do some DNS work. The DNS server that's authoritative for each domain you host must point the domain's MX record to the same host A record that contains the IP address of your SMTP host. If you don't host your own DNS, contact your ISP about making these changes.