To setup an email forwarder your domain names nameservers must be set to the default nameserver option, otherwise you will need to contact your web host.

Login to your domain management control panel

Click the Manage Domain link

Click the Settings link next to the domain you want to redirect.

In the Email Forwards box at the top of the screen there will be two boxes

Enter the mailbox you want to redirect from in the Original Address feild, this is the box on the left. (Use only the mailbox name not the email address ie use myname NOT myname@mydomain.co.nz)

Enter the email address you want to the redirect to be sent to in the Redirect to field (i.e myname@myotherdomain.co.nz)

Click the Add Forward button