[exim] Exim redirector construction

Hi, I'm new to exim and I´having problems to find the syntax to do the
following:

if incoming message is for domain.com
   then
       if exist a directory named   /whatever_path/username@???
       then
         accept it (it will be piped to script that process it)
       else
         reject it at smtp time

Obviously the account username@??? does not really exist in the
server and I´m using a catch all address to get all the mails.

I think this should be done with a redirector, but I'm not sure.

Any idea about how to do this?

Thanks!
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