Problems with virtual domains

Hi,

i try to get virtual domains to run with postfix 2.1 and FreeBSD 5.3.
My main.cf:

virtual_mailbox_domains = first.de, second.de, third.de
virtual_mailbox_base = /var/mail/vhosts
virtual_mailbox_maps = hash:/usr/local/etc/postfix/vmailbox
virtual_alias_maps = hash:/usr/local/etc/postfix/virtual
virtual_transport = virtual
virtual_create_maildirsize = yes

So in my understanding i do not need the user be a system user. But, how
to generate that user?

So, my virtual looks like:
postmaster@first.de postmaster
postmaster@second.de postmaster
postmaster@third.de postmaster
test@second.de test
test@third.de test

My vmailbox:
postmaster@first.de first.de/postmaster/
postmaster@second.de second.de/postmaster/
postmaster@third.de third.de/postmaster/
test@second.de second.de/test
test@third.de third.de/test

If i send a message (using telnet on that machine an 127.0.0.1) to
postmaster@second.de, root on that machine will get the message:

Jan 24 09:33:47 hanna postfix/local[86735]: 67F881CC3D:
to=<root@first.de>, orig_to=<postmaster@second.de>, relay=local,
delay=21, status=sent (delivered to mailbox)

So, also user "test" is not found...

In my understanding everything looks fine in my configuration, so what
could be the problem?
Need more information?

stupid. forget about the question.