How to Create New E-Mail Addresses in Lion Server
When you create a user account after mail service has been set up and started, Lion Server automatically creates an e-mail address based on the short name followed by the domain name — for example, firstname.lastname@example.org.
You can create additional e-mail addresses for any user. For example, you might assign email@example.com to a user who’s responsible for a public website.
To create an alternative e-mail address for a user, you must use Workgroup Manager to create a second short name for the user. Here’s how:
In Workgroup Manager, click the Accounts icon in the toolbar.
Click the globe icon below the toolbar on the left and select the account’s directory domain.
Log in if prompted.
Select the user from the list on the left.
Click the Basic tab.
If a virtual host is enabled, type the full e-mail address (for example, firstname.lastname@example.org).
Click the Save button.