How can I setup a catch-all on my domain?

Adding a "catch-all"
If you want to catch all the e-mail send to a domain irrespective of the address that was used you can do so at the "Settings" page of the domain. You can select a mailbox every e-mail send to anything@thedomain needs to go to.
Path: Dashboard ➔ Domains ➔ Manage ➔ Settings