Access CWP, menu "Email" >> "Email Aliases/Forwarders" >> "Add New Alias", select the user of your domain, and fill in fields:
Email Address: *
Forward To: [The final E-mail Adress destiny here]
The order of aliases creation seems important.
In my case was important the order of alias creation.
Fisrt I created the "catch-all", after some other specific address. It was sending all mails to catch-all although created a specific other alias.
So, If you have another specific alias to coexist with you catch-all address, you must try to create it before the catch-all address.
Regards,
Netino