Hi,
You can use the Add/Modify Property wizard:
1. Launch the Adaxes Administration Console.
2. In the Console Tree, expand the <service> / Active Directory / <domain>.
3. Select the OU you need.
4. Select and right-click the users you want to update in the Result Pane.
5. Select Add/Modify Property from the context menu.
6. Select the Email property in the list of properties and click Next.
7. Specify the value template for the selected property. For example, %username%@yourdomain.com
8. Click Finish. Emails of all the selected users will be updated.
Regards