relay setup & tmda protected maildir ?

"Sam Ami" <[email protected]> Tue, 15 Apr 2008 17:03:30 +1000
Newsgroups gmane.mail.spam.tmda.user,gmane.mail.spam.tmda.devel
Message-ID <[email protected]>
hi folks

is it possible to setup tmda (+ tmda-cgi) on a qmail relay that acts
as a relay AND also protects users accounts IF users chooses to sign
up ?
i understand that i will need to setup accounts on the relay that will
forward to internalserver
ultimately, regardless of weather the users signs up or not the email
needs to be "|/var/qmail/bin/forward [email protected]

netqmail-1.06
tmda-1.1.12
tmda-cgi-0.16.4
vpopmail-5.4.25