Configure postfix virtual users for relaying?

Pandu Poluan <[email protected]> Wed, 16 Nov 2011 13:39:30 +0700

Newsgroups	gmane.linux.gentoo.server
Message-ID	<CAA2qdGX-avXr_2RA=AF_F_J9ZhRkZr8hTsEDytg+ThCHVPnnaA@mail.gmail.com>

I want to know if I can configure virtual users in postfix, yet still have
postfix perform mail relay?

To illustrate: I want postfix to reject all RCPT TO whose destination
address is not part of a list, but if the destination address *is* part of
the list, postfix should relay the mail to a final destination server.

Rgds,