Catchall redirects to an external address

[Nebhead]

I can't seem to figure out how to set up a catchall address that redirects to an standard email address, rather than a mailbox. Is this possible within ISPConfig 3?

Scenario is: I host a website/domain for a friend, but he wants to continue using his own mail set up. He wants the freedom to invent addresses as he goes, and have all these emails redirect to his primary email address.

My current hosting solution (which is shutting down in a few months, hence me setting up my own server) allows me to just put a catch-all redirect in place to handle this.

ISP Config 3, on the other hand, only seems to allow EITHER a catchall -> mailbox OR an email redirect -> external address, where new redirects need to be added for each address.

Any help here would be greatly appreciated.