Auto-Reply to one specific email address

I have a catch-all (default address) set up for one of the domains being hosted by a shared hosting provider. Most inbound email to that domain goes to a specific email address (let's call it xyz@example.com) but some goes to other addresses that I might not be aware of, hence the need for the catch-all (default address). I'm wondering if there is any mechanism that would allow me to set up a rule in cPanel so that emails that come in from a certain email address (let's say person@outside_domain.com) and are addressed to xyz@example.com will send back an auto-reply to person@outside_domain.com but also be delivered according to the catch-all (default address). I tried this with the auto-responders but there is no way to specify an inbound email address to match the auto-responder with - it just responds to everything sent to xyz@example.com. And not only that, but because there is no forwarder or mailbox set up, it discards the inbound message after auto-responding instead of delivering it according to the catch-all (default address). Any thoughts? Thanks!