Qmail and Domain Aliases on Plesk 8.2

In my Plesk 8.2 I use domain aliases but I need to be able to create e-
mail redirects on the aliased domains. Plesk interface does not seem
to allow that.

How can I add a new mail redirect for a domain that is not listed in /
var/qmail/mailnames ?

I tried to create
domain.org/username/.qmail

and in it I set
| true
&user@gmail.com

But when I then tested it by sending a mail to username@domain.org I
got an error message that the address does not receive mail.

Any ideas?

Thanks!!

Tomas