You can configure mail forwarding through our Controlpanel at the E-mail Administration page.
Below "Forwarding" it's possible to specify both emails that exists on the domain, as well as emails that don't have the domain address after "@".
In case you wish to add more mail addresses at once, it can easily be done by separating it with a semicolon. As an example: john@ue-example.com;mette@ue-example.com