This article applies to 123-reg VPS hosting running Plesk 10
This article will explain how to specify a Catchall E-mail Account in Plesk.
When e-mail messages are sent to an address that has not been created under your domain you can choose to have these messages redirected to a single address, which is also known as a catchall. In the E-Mail Addresses section on the Mail tab click on Change Settings, then choose Forward to Address and type the address where you want the messages to be sent.
The new catchall e-mail has been setup and now whenever a message is sent to a non-existent address on your domain it will be re-routed to the new specified address.